Hidradenitis Suppurativa Symptoms: Early Signs to Watch For

Written by Dr. rer. nat. Dennis Alexander Kwiatkowski

Hidradenitis suppurativa — also known as acne inversa — is a chronic inflammatory skin condition that affects roughly 1 to 4 percent of the population. Despite being far from rare, it remains widely underrecognised. One of the biggest reasons is that the early symptoms of HS look deceptively ordinary. A painful bump in the armpit. A recurring “boil” in the groin. Something that seems like it should go away on its own — until it doesn’t.

This article explains what the early signs of hidradenitis suppurativa actually look like, where they tend to appear, and why recognising them matters more than most people realise.

Why Early Recognition Matters

Research consistently shows that the average time between the first appearance of HS symptoms and a correct diagnosis is between 7 and 10 years. A large German study of nearly 400 HS patients found that patients consulted more than three different physicians on average and received multiple incorrect diagnoses before HS was finally identified. A separate Portuguese study of 285 patients confirmed a mean diagnostic delay of just over 10 years — with no significant improvement in recent years compared to earlier periods.

This delay is not harmless. The longer HS goes unrecognised, the more likely it is to progress. Scar tissue builds up, sinus tracts form beneath the skin, and the window for effective early treatment narrows. People who are diagnosed later also tend to present with more severe disease and are more likely to develop associated conditions, including cardiovascular and psychological comorbidities.

Knowing the early signs is, in many cases, the first step toward shortening that gap.

The Earliest Symptom: A Painful, Deep Lump

For most people, the very first sign of HS is a single painful lump deep under the skin. It typically feels firm, tender to the touch, and sits below the surface rather than on it. In appearance, it can closely resemble a deep pimple, an inflamed cyst, or a boil.

This is exactly why it gets missed. The lump may seem like a one-off skin irritation — something caused by shaving, friction, or sweat. It may even resolve on its own after a few days or weeks. But unlike an ordinary boil, it tends to come back. And it tends to come back in the same general area.

What makes it different from a regular boil or pimple:

• It sits deeper in the skin.
• It is often more painful than it looks.
• It recurs in the same body region, sometimes in the exact same spot.
• It doesn’t respond well to standard acne treatments.

If you experience a deep, painful lump that keeps returning in a skin-fold area, that pattern alone is reason enough to see a dermatologist.

Where HS Symptoms Typically Appear

HS has a strong preference for areas of the body where skin touches skin. The most common locations include:

• Armpits — one of the most frequent early sites
• Groin and inner thighs — another very common area, particularly in women
• Under the breasts — especially as the condition progresses
• Buttocks and perianal area — including the gluteal folds
• Lower abdomen — particularly along the waistline or belt area

Less commonly, HS can also appear near the ears, around the navel, or on the back of the neck. Involvement of the face or upper back is possible but rare.

The location pattern is an important diagnostic clue. Ordinary acne typically appears on the face, chest, and upper back. HS, by contrast, favours the intertriginous zones — the warm, moist areas where friction is constant. If recurring lumps are showing up in these areas rather than on the face or shoulders, HS should be considered.

Prodromal Symptoms: The Warning Signs Before a Flare

Many people with HS report experiencing a set of warning sensations before a visible lump actually forms. In the medical literature, these are called prodromal symptoms, and research suggests that roughly half of all HS patients experience them.

These early warning signs can include:

• Burning or stinging in a localised area
• Itching or prickling beneath the skin
• Warmth in a specific spot, sometimes accompanied by slight swelling
• A pulling or pressure sensation under the skin
• Increased sweating in the affected area

These sensations can precede a visible lesion by 12 to 48 hours. For people who already know they have HS, learning to recognise prodromal symptoms can help with early intervention. For people who haven’t been diagnosed yet, these recurring sensations in skin-fold areas are an important signal worth mentioning to a doctor.

How Symptoms Change Over Time

HS is a progressive condition. If left untreated, it tends to move through recognisable stages, each with its own characteristic symptoms. The most commonly used classification is the Hurley staging system.

Hurley Stage I — Mild

Single or multiple isolated lumps (nodules or abscesses) that form and may resolve, with no permanent scarring or tunnel formation. Flares come and go. Many people remain at this stage for years without a diagnosis, assuming the lumps are just recurring boils.

Hurley Stage II — Moderate

Recurrent abscesses with early scar tissue and the beginning of sinus tract (tunnel) formation. The lumps may start to cluster, and some areas of the skin may thicken. Drainage of fluid or pus becomes more common.

Hurley Stage III — Severe

Widespread, interconnected sinus tracts and abscesses across an entire anatomical area, with significant scarring. Movement can become restricted. Chronic drainage and odour may affect daily life.

The goal of early recognition is to identify HS at Stage I — before permanent structural damage occurs — and to begin appropriate management as early as possible.

What HS Is Commonly Mistaken For

Part of the reason HS is diagnosed so late is that it overlaps visually with several common conditions. The most frequent misdiagnoses include:

• Boils or furuncles — by far the most common confusion, especially early on
• Folliculitis — infected hair follicles, often in the same body areas
• Acne vulgaris — particularly when lumps appear after puberty
• Inflamed epidermoid (sebaceous) cysts — similar in feel and location
• Abscesses from infection — especially when there is drainage
• Cutaneous Crohn’s disease — in perianal presentations

A key differentiator is the pattern. A single boil that appears once and heals is usually not HS. Recurring lumps in skin-fold areas that keep coming back over months or years — that pattern points toward something more systematic. If a doctor has drained the same area more than once without investigating further, it may be worth asking specifically about hidradenitis suppurativa.

When to See a Dermatologist

There is no blood test or imaging study that diagnoses HS. The diagnosis is clinical — meaning it is based on what the lesions look like, where they are, and how they behave over time. The standard diagnostic criteria are straightforward:

1. Typical lesions — deep nodules, abscesses, sinus tracts, or scarring
2. Typical locations — armpits, groin, inner thighs, under the breasts, buttocks
3. Chronicity and recurrence — symptoms that come back over a period of at least six months

You should see a dermatologist if you experience:

• Painful lumps in skin-fold areas that recur over weeks or months
• Deep bumps that don’t respond to standard acne or antibiotic treatment
• Lumps that drain fluid or pus and leave behind thickened skin
• Recurring abscesses that a doctor has incised and drained more than once
• Any of the prodromal symptoms described above appearing regularly in intertriginous areas

Early referral to a dermatologist is one of the most impactful steps in the HS journey. The earlier the condition is recognised and managed, the better the long-term outlook. It can also help to come prepared — here are 15 questions to ask your dermatologist about acne inversa.

What You Can Do Right Now

If anything in this article sounds familiar, here are a few practical next steps:

• Document what you’re experiencing. Take note of where the lumps appear, how often they come back, how long they last, and whether you notice warning sensations beforehand. A simple log on your phone is enough.
• Photograph your symptoms. Lesions may resolve before your appointment. Having photos can help your doctor see what the active flare looked like.
• Ask specifically about HS. If you’ve been told repeatedly that you have boils or cysts, and they keep coming back in the same areas, bring up hidradenitis suppurativa by name. Many patients report that their diagnosis only happened after they raised the possibility themselves.
• Request a referral to a dermatologist. HS is best managed by a specialist familiar with the condition. If your general practitioner is unsure, a dermatology referral is the logical next step.

The Bottom Line

Hidradenitis suppurativa often starts quietly — a single painful bump that comes and goes. It can take years before the pattern becomes obvious, and years more before someone gives it the right name. The average diagnostic delay of 7 to 10 years is one of the longest of any common skin condition, and much of it comes down to the fact that early HS simply doesn’t look dramatic enough to trigger alarm.

But the signs are there if you know what to look for: recurring deep lumps in skin-fold areas, prodromal sensations like burning or stinging before a flare, and a pattern that doesn’t match typical acne or infection. Recognising these early signals — and acting on them — is one of the most meaningful things you can do for your long-term skin health.

If something about your symptoms doesn’t feel right, trust that instinct. And bring it to a dermatologist who can look at the full picture.