Quick overview
- The skin fold under the breast is one of the typical regions affected by acne inversa.
- A superficial sore area is not automatically HS.
- More important are recurring deep painful nodulesNodule: 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., abscessesAbscess: 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., dischargeDischarge / Exudate: Fluid coming from an Acne Inversa lesion or tunnel. Can be clear (serous), bloody (sanguineous), pus-like (purulent), or a mix., scarring, or tunnelsSinus 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..
- Clothing, friction, and dressing care are part of the disease burden and may be described factually.
A typical, often practically burdensome spot
The inframammary fold, i.e. the skin fold under the breast, is one of the typical regions in acne inversa. Symptoms there can become especially noticeable due to skin contact, moisture, bra edges, or dressing issues.
What may fit HS there
Possible indicators are recurring:
- deep painful nodules,
- abscesses or open weeping spots,
- scars and hardened areas after inflammation,
- symptoms occurring together with involvement of the armpits, groin, or buttocks.
The region alone does not prove a diagnosis. Especially in skin folds, there are various causes of redness and irritation. Recurring deep inflammatory lesions should therefore be described factually and assessed professionally. For a broader overview of possible indicators, see the article on acne inversa symptoms to watch for.
Deep lesion or superficial irritation?
For description purposes, it helps to distinguish between more superficial irritation and deeper inflammatory lesions:
| Observation | Why it may be important |
|---|---|
| more widespread redness or burning | can also fit irritation in skin folds |
| deep painful nodule | fits the HS pattern more closely if it recurs |
| open weeping spot | describes discharge and the need for dressings |
| scar, hardened area, or suspected tunnel | describes lasting changes |
This distinction does not replace an examination. However, it helps to describe the symptoms more precisely.
Why everyday life quickly becomes relevant here
Under the breast, even a small open spot can influence many decisions: which clothing fits comfortably, whether friction increases, how secure a dressing feels, and whether odor or discharge cause concern.
These practical points are not a side issue. They show what kind of support is actually needed in everyday life.
What the differentiation should clarify
In skin folds, besides HS, irritation, intertrigo, folliculitis, infectious causes, or other skin conditions can also play a role. This is why a precise description matters: depth, recurrence, discharge, scarring, and involvement of other typical HS regions all affect the assessment.
It is also useful to note whether symptoms occur on one side, both sides, or along the entire breast fold. This information can help distinguish local irritation from a recurring pattern of lesions.
What you can document
Note down:
- whether the spots recur,
- whether they are deeply painful or more superficially irritating,
- whether discharge, scarring, or tunnels are noticeable,
- which clothing or movement increases the burden.
This allows an appointment to distinguish between location, course, and burden. It can help to review 15 questions to ask your dermatologist beforehand.
When medical assessment becomes important
Recurring painful nodules under the breast deserve dermatological attention. Rapidly increasing redness, fever, severe pain, or a worsening wound should be assessed promptly.
Terms explained in this article
Quick definitions of the key medical terms. Select any term for its full glossary entry.
- Nodule
- 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.
- Abscess
- 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.
- Discharge / Exudate
- Fluid coming from an Acne Inversa lesion or tunnel. Can be clear (serous), bloody (sanguineous), pus-like (purulent), or a mix.
- Sinus 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.
FAQ
Are red or sore spots under the breast always acne inversa?
No. In skin folds, irritation, friction, infections, or other causes can also play a role. Signs more suggestive of HS include recurring deep painful nodules, abscesses, discharge, scarring, or involvement of other typical HS regions.
Why is the breast fold relevant in HS?
The inframammary fold is one of the typical HS regions. Friction, moisture, clothing, and dressing-related issues can further increase the burden in everyday life.
What should be described at the appointment?
It helps to describe recurrence, depth, and pain of the lesions, discharge, scarring, tunnels, the affected side, the influence of clothing, and whether the armpits, groin, or buttocks are also affected.
When should I seek prompt medical help?
Rapidly increasing redness, fever, severe pain, or a wound that is clearly worsening should be assessed by a doctor promptly.
References
- S2k Guideline on the Therapy of Hidradenitis Suppurativa / Acne Inversa AWMF, 2024
- Hidradenitis Suppurativa U.S. Food and Drug Administration, 2024
- North American clinical management guidelines for hidradenitis suppurativa, Part I Journal of the American Academy of Dermatology, 2019
