# Acne Inversa (Hidradenitis Suppurativa) Under the Breast

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Language: en
Category: Diagnosis
Published: 2026-05-21
Last updated: 2026-05-24
Last editorially reviewed: 2026-05-24
Next scheduled review: 2027-05-24

Author: Dr. rer. nat. Dennis Alexander Kwiatkowski (Biochemist, Scientific Writer and Pharma Expert)
Scientific editor: Dr. rer. nat. Dennis Alexander Kwiatkowski
Reviewer qualifications: Biochemist, Scientific Writer and Pharma Expert
Review scope: Scientific literature, clinical guidelines, sources, and editorial clarity
Clinical reviewer: No independent clinical review
Tags: Acne Inversa, Hidradenitis Suppurativa, HS, Diagnosis, breast fold, acne inversa, hidradenitis suppurativa, symptoms

> Recurring painful lesions under the breast can fit the pattern of acne inversa. This article helps make sense of symptoms, friction, and helpful things to observe before your appointment.

Medical disclaimer: This website is for general educational information only and does not replace medical advice, diagnosis, or treatment. Please speak with qualified medical professionals about symptoms or treatment decisions.

## Article

## 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 nodules, abscesses,
  discharge, scarring, or tunnels.
- 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](/en/blog/hidradenitis-suppurativa-armpits/), [groin](/en/blog/hidradenitis-suppurativa-groin/), or [buttocks](/en/blog/hidradenitis-suppurativa-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](/en/blog/hidradenitis-suppurativa-symptoms-what-to-look-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:

1. whether the spots recur,
2. whether they are deeply painful or more superficially irritating,
3. whether discharge, scarring, or tunnels are noticeable,
4. 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](/en/blog/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.

## 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

1. S2k Guideline on the Therapy of Hidradenitis Suppurativa / Acne Inversa - AWMF, 2024 - https://register.awmf.org/assets/guidelines/013-012l_S2k_Therapie-Hidradenitis-suppurativa-Acne-inversa_2024-08.pdf
2. Hidradenitis Suppurativa - U.S. Food and Drug Administration, 2024 - https://www.fda.gov/consumers/health-education-resources/hidradenitis-suppurativa
3. North American clinical management guidelines for hidradenitis suppurativa, Part I - Journal of the American Academy of Dermatology, 2019 - https://pubmed.ncbi.nlm.nih.gov/30872156/