HS and Lymphedema: When Genital or Groin Swelling Is More Than a Flare

Swelling is a familiar part of an HS flareFlare: A period of acute worsening in a chronic condition. In Acne Inversa, a flare may be triggered by stress, hormonal changes, friction, or other factors and can manifest as new nodules, abscesses, or increased pain.FlareA period of acute worsening in a chronic condition. In Acne Inversa, a flare may be triggered by stress, hormonal changes, friction, or other factors and can manifest as new nodules, abscesses, or increased pain.Read more in the glossary. It usually rises with an inflamed noduleNodule: A firm, palpable lump deep in tissue. Nodules can be painful and may progress to abscesses. They are among the typical early signs of Acne Inversa.NoduleA firm, palpable lump deep in tissue. Nodules can be painful and may progress to abscesses. They are among the typical early signs of Acne Inversa.Read more in the glossary or abscessAbscess: An inflamed cavity or swelling containing pus or fluid. In hidradenitis suppurativa, abscesses can form as part of the inflammatory disease process and do not automatically mean that a bacterial infection is present. Secondary bacterial infection can occur and may require separate medical assessment. In Acne Inversa, abscesses occur mainly in the armpits, groin, and other skin folds.AbscessAn inflamed cavity or swelling containing pus or fluid. In hidradenitis suppurativa, abscesses can form as part of the inflammatory disease process and do not automatically mean that a bacterial infection is present. Secondary bacterial infection can occur and may require separate medical assessment. In Acne Inversa, abscesses occur mainly in the armpits, groin, and other skin folds.Read more in the glossary and settles again as the lesion resolves.

But in some people with long-standing, severe HS, swelling in the genital or groin area stops following that pattern. Instead of coming and going with individual lesions, it stays broad, firm, and slowly enlarges over months or years. A small number of published medical reports describe this as lymphedema — a build-up of fluid caused by damage to local lymphatic drainage — occurring as a rare complication of chronic HS.

This is not common. Most people with HS, including most people with severe or long-standing disease, will never develop it. But because the pattern can be mistaken for “just another flare,” it is worth knowing what has actually been reported, so that persistent or unusual swelling gets raised with a clinician rather than assumed away.

What is lymphedema?

The lymphatic system is a network of vessels and nodes that drains excess fluid from body tissue back into the bloodstream. When that drainage is impaired — from scarring, obstruction, or damage to lymphatic vessels — fluid can build up in the tissue instead. Over time this can cause persistent swelling, a feeling of heaviness, and changes in the skin itself, including thickening, firmness, and sometimes a rough or wart-like (“verrucous”) surface.

Lymphedema has many possible causes unrelated to HS — including surgery, radiation, infection, and other chronic conditions. HS is only one of them, and a rare one.

How can HS lead to lymphedema?

The exact mechanism is not fully worked out. The leading explanation in the published literature is that years of recurring inflammation, tunnelSinus Tract: A tunnel-like channel under the skin that forms between abscesses or nodules. Sinus tracts indicate more advanced disease and can chronically drain fluid. They are associated with Hurley Stages II and III.Sinus TractA tunnel-like channel under the skin that forms between abscesses or nodules. Sinus tracts indicate more advanced disease and can chronically drain fluid. They are associated with Hurley Stages II and III.Read more in the glossary formation, and scarring in HS-affected skin can progressively damage or obstruct the local lymphatic vessels that would normally drain that tissue. Once drainage is sufficiently impaired, fluid accumulates and the tissue changes associated with lymphedema can follow.

This process appears to require prolonged disease. In the largest and most detailed case collection — a 2018 systematic review that identified 27 published patients across two case series and 15 case reports — those patients had lived with HS for an average of about 18 years, with a range of 4 to 30 years (according to PubMed, Micieli & Alavi, International Journal of Dermatology, 2018). That describes the patients who happened to be published, not a fixed timeline that applies to any individual — plenty of people live with HS for decades and never develop this complication, and it is not possible to predict who will.

Where has HS-associated lymphedema been reported?

The anogenital region dominates the published literature by a wide margin. In the 2018 systematic review of 27 patients, the affected areas, in order of frequency, were:

• Scrotum — 16 patients (59%)
• Penis — 12 patients (44%)
• Labia majora — 4 patients (15%)
• Perineum — 3 patients (11%)
• Groin — 3 patients (11%)
• Buttocks — 2 patients (7%)
• Abdomen — 1 patient (4%)

Six patients (22%) had swelling in more than one of these locations at once (according to PubMed, Micieli & Alavi, 2018). A 2025 case report and literature review expanded the published total to 51 patients and again found that the majority were men with long-standing, severe HS (according to PubMed, Pourgholi et al., Dermatology Online Journal, 2025). A 2026 case series specifically describing three men with severe penoscrotal lymphedema and longstanding Hurley stageHurley Stage: A regional, mainly structural classification system for Acne Inversa in one specific body region, in three stages: Stage I (single abscesses without sinus tracts), Stage II (recurrent abscesses with isolated, still-separated sinus tracts), Stage III (extensive, interconnected sinus tracts and scarring across an entire region). Named after Dr. Helen Hurley. Classic Hurley staging is static and isn't designed to reflect short-term inflammatory activity or response to medical treatment — IHS4 is used alongside it for that.Hurley StageA regional, mainly structural classification system for Acne Inversa in one specific body region, in three stages: Stage I (single abscesses without sinus tracts), Stage II (recurrent abscesses with isolated, still-separated sinus tracts), Stage III (extensive, interconnected sinus tracts and scarring across an entire region). Named after Dr. Helen Hurley. Classic Hurley staging is static and isn't designed to reflect short-term inflammatory activity or response to medical treatment — IHS4 is used alongside it for that.Read more in the glossary III disease is consistent with this same pattern (according to PubMed, Kılgın et al., Skin Appendage Disorders, 2026).

Involvement outside the anogenital region — for example the abdomen, as in one of the 27 reviewed patients — has been described but is distinctly uncommon.

What can it look or feel like?

Published descriptions include:

• persistent swelling that does not fully settle between flares;
• firm or indurated (hardened) tissue rather than the soft swelling of acute inflammation;
• thickened skin;
• sometimes a rough, verrucous (wart-like) surface change over the swollen area;
• in men, enlargement of the scrotum and/or penis severe enough in some cases to bury the penis within surrounding tissue.

In the most severely affected published cases, this has interfered with walking, sitting, clothing, urination, and sexual activity, and has caused substantial psychological and quality-of-life burden (according to PubMed, Kılgın et al., 2026; Yaman et al., Journal of Wound Care, 2024).

None of these features, alone or together, are a way to diagnose lymphedema from a description or a photograph. They describe what has been reported in the medical literature, not a checklist for self-assessment.

How is this different from an ordinary HS flare?

There is no reliable way to tell the two apart yourself, but the pattern over time tends to look different.

A typical flare usually involves one or more discrete, tender lumps that may drain, and that come and go — worsening over days, then settling, sometimes leaving a scar behind. The swelling largely tracks the active lesion.

The swelling described in published lymphedema cases tends to be broader than a single lesion, less clearly centered on one inflamed spot, more persistent between episodes, and progressively larger over months or years rather than fluctuating with individual flares. Firmness and skin thickening, rather than the tenderness of an acute abscess, are also more characteristic.

The useful question is not “can I diagnose this myself?” It is: “Is this swelling behaving differently from my usual HS?” If the answer is yes — particularly if it is getting broader, firmer, or larger over time rather than settling — that change is worth describing specifically at your next appointment, or sooner if it is worsening quickly.

Is genital or groin swelling always caused by HS?

No. Someone with HS is not exempt from every other cause of genital or groin swelling. Depending on the individual situation, a clinician may need to consider infection, an unrelated vascular problem, a hernia, other lymphatic conditions, a reaction to treatment, or a separate inflammatory condition, in addition to HS itself. A website cannot sort through these possibilities — only an examination, and sometimes further testing, can.

Can HS-related genital lymphedema become serious?

Most of what is published describes a slowly progressive, chronic problem rather than an emergency. But it is not always benign if left unmanaged.

A 2025 case report described a man with untreated, long-standing HS whose scrotal lymphedema became complicated by cellulitis and sepsis — a serious bloodstream infection — and who died two weeks after hospitalization despite treatment (according to PubMed, Pourgholi et al., 2025). Separately, the 2026 case series included one patient whose severe, longstanding penoscrotal lymphedema was complicated by secondary (AA) amyloidosis with chronic kidney disease — a rare, serious systemic consequence of decades of unresolved chronic inflammation (according to PubMed, Kılgın et al., 2026).

These outcomes are not typical of the published literature as a whole, and they should not be read as “this is what usually happens.” They are, however, real documented outcomes of leaving severe, longstanding, unmanaged disease unassessed — which is the central reason this article exists: not to alarm, but to make the case that progressive swelling in this context deserves a clinical opinion rather than being treated as routine.

Who is more likely to develop this complication?

The published literature consistently describes people with long-standing HS, more advanced disease severity (frequently described using the Hurley staging system as Hurley stage III, the most advanced category), and genital, groin, or perineal disease. Because the evidence is limited to case reports and small case series rather than population-level studies, it is not possible to state a percentage risk, and this article deliberately does not attempt to.

Does treating HS help?

The evidence here is limited and comes from very small numbers of patients, so it should be read as illustrative rather than as a treatment recommendation.

One 2024 case report described a 56-year-old man with Hurley stage III HS and two years of progressive scrotal swelling that had not responded to several systemic antibiotic and biologicBiologic: A class of medications derived from living cells that target specific components of the inflammatory process. For Acne Inversa, biologics such as adalimumab and secukinumab are used when other treatments are insufficient.BiologicA class of medications derived from living cells that target specific components of the inflammatory process. For Acne Inversa, biologics such as adalimumab and secukinumab are used when other treatments are insufficient.Read more in the glossary treatments. He was treated with complex decongestive therapy (a structured, physiotherapist-led approach combining manual lymphatic drainage, compression, and skin care) alongside a newly started biologic for his HS, plus education in self-drainage and skin care. After six sessions over 14 days, his scrotal swelling was significantly reduced, with an easier and less painful ability to urinate (according to PubMed, Yaman et al., 2024). This is a single case and cannot establish how well this approach works in general.

The 2026 case series treated its three patients with systemic antibiotics and a TNF-alpha inhibitor (adalimumabAdalimumab: A biologic drug from the class of TNF-α inhibitors and the first medication officially approved for treating moderate-to-severe Acne Inversa. It is marketed under the brand name Humira® and as biosimilars.AdalimumabA biologic drug from the class of TNF-α inhibitors and the first medication officially approved for treating moderate-to-severe Acne Inversa. It is marketed under the brand name Humira® and as biosimilars.Read more in the glossary), with a variable clinical response, and specifically noted that early recognition and timely biologic therapy for the underlying HS may help prevent progression to the point where surgery becomes necessary (according to PubMed, Kılgın et al., 2026).

The 2018 systematic review found that just over half of the 27 published patients (52%) were ultimately treated with radical surgical excision combined with medical therapy, with favorable outcomes reported (according to PubMed, Micieli & Alavi, 2018).

Taken together, published approaches include HS-directed medical therapy, decongestive/lymphedema-focused therapy, and surgery — sometimes in combination. No single approach is established as preferred for everyone; the right path depends on severity, how established the tissue changes are, and the individual’s overall clinical picture, and that decision belongs to the treating team, not to this article.

Why does surgery sometimes become involved?

When lymphedema is extensive and the tissue changes are advanced or unlikely to reverse with medical treatment alone, published cases frequently describe surgical excision of the affected tissue, followed by reconstruction — for example using skin grafts or flaps to close the resulting defect (according to PubMed, Micieli & Alavi, 2018).

This does not mean surgery is automatically required, or that it is the first step. It means that, when it is needed, severe HS-related lymphedema often becomes a multidisciplinary problem, drawing in dermatologyDermatology: The medical specialty concerned with diagnosing and treating skin conditions. Acne Inversa is often managed by dermatologists, although surgery and other specialties may also be involved.DermatologyThe medical specialty concerned with diagnosing and treating skin conditions. Acne Inversa is often managed by dermatologists, although surgery and other specialties may also be involved.Read more in the glossary, plastic or reconstructive surgery, and — particularly for penoscrotal disease — urology, alongside wound care and, where relevant, gynecology for vulvar involvement. Our guide to wound healing after HS surgery covers the general recovery process for HS-related surgical wounds.

When should I bring swelling up with my healthcare team?

Consider raising it specifically — not just as “my HS is worse” — if the swelling:

• persists well beyond your usual flare pattern and does not settle;
• is progressively enlarging over weeks or months;
• affects a broader area than a single lesion;
• feels firm or hardened rather than tender and acute;
• is changing the surface of the skin (thickening, a rough or wart-like texture);
• is making walking, sitting, clothing, urination, or sexual activity noticeably harder;
• is different from anything you have experienced with HS before.

If swelling is new, rapidly worsening, very painful, or accompanied by fever, feeling generally unwell, or difficulty urinating, that combination points toward a possible acute problem — including infection — and deserves prompt medical attention rather than waiting for a routine appointment.

What should I tell my clinician?

Specific, time-based detail is more useful than a general impression. Consider including:

• when the swelling started, and whether it has changed since;
• whether it tracks with your HS flares or persists independently of them;
• how long you have had HS in that area;
• whether it is affecting walking, sitting, clothing, urination, or sexual activity;
• any previous surgery in the area;
• how this swelling compares with your usual pattern.

For example: “I’ve had HS in this area for over a decade, but over the last six months the swelling here has become much broader, and it doesn’t go down anymore even when the active lesions settle.” That is more actionable than “my HS is worse than usual.”

→ Add swelling episodes to the Symptom Tracker to build that timeline between appointments — it documents a pattern; it does not diagnose one.

Which clinicians may become involved?

Depending on severity and location, care for HS-associated lymphedema can draw on several specialties working together:

Dermatology manages the underlying HS and assesses overall disease activity.

Plastic or reconstructive surgery becomes relevant when tissue changes are advanced enough that surgical excision and reconstruction are being considered.

Urology is often involved for significant penile or scrotal involvement, particularly where urination is affected.

Gynecology may be involved where the vulvaVulva: The external female genital area, including the outer and inner labia, clitoral region, and the tissue around the vaginal opening. HS can affect the hair-bearing outer vulva and adjacent groin skin in particular, but a recurring lump there has several possible causes, including a Bartholin cyst, folliculitis, or an infection.VulvaThe external female genital area, including the outer and inner labia, clitoral region, and the tissue around the vaginal opening. HS can affect the hair-bearing outer vulva and adjacent groin skin in particular, but a recurring lump there has several possible causes, including a Bartholin cyst, folliculitis, or an infection.Read more in the glossary or labia majora are affected.

Lymphedema-focused physiotherapy or rehabilitation services can offer decongestive therapy where that is appropriate.

Not everyone needs all of these — the pathway depends on the individual situation, and it is reasonable to start with the clinician managing your HS and ask whether further referral makes sense.

What this article does not mean

This article is not saying that ordinary HS swelling is usually lymphedema, that every episode of genital or groin swelling needs urgent investigation, that surgery is always the outcome, that a percentage risk can be calculated for any individual, or that this complication can be diagnosed from a description or photograph on this website. Most swelling that occurs with HS is exactly what it appears to be: part of an active flare.

The bottom line

Lymphedema is an uncommon but genuinely reported complication of long-standing, severe HS, concentrated in the genital, groin, and perineal region. Most people with HS will never develop it. The useful signal is a change in pattern: swelling that stops resolving the way your usual flares do, and instead stays broad, firm, or keeps slowly enlarging. That is worth naming specifically to your care team — not because it is likely to be lymphedema, but because persistent, progressive swelling in this context is a recognized reason for a closer look, and because, in the small number of published cases where it went unassessed for a long time, the outcomes were sometimes serious.

If genital or groin HS is part of your experience more broadly, our guides on HS in the intimate area, HS in the groin, and vulvar HS cover the wider picture, and our directory of HS-experienced clinicians can help you find the right person to examine a change like this.