# Hidradenitis Suppurativa Under the Armpits

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Language: en
Category: Diagnosis
Published: 2026-05-21
Last updated: 2026-05-22
Author: Dr. rer. nat. Dennis Alexander Kwiatkowski (Biochemist, Scientific Writer and Pharma Expert)
Tags: Acne Inversa, Hidradenitis Suppurativa, HS, Diagnosis, armpits, hidradenitis suppurativa, acne inversa, symptoms

> The armpits are a typical region affected by hidradenitis suppurativa. Read about the symptoms that may stand out, why arm movements matter, and what helps at 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

## Why armpit symptoms can be typical in HS

The armpit region is one of the classic locations affected by hidradenitis suppurativa. Inflammatory nodules, abscesses, weeping areas, scars and tunnels can develop there.

Because the armpit is involved in almost every arm movement, the burden there often quickly becomes functional: getting dressed, showering, lifting, working or sleeping positions can be painful.

## At a glance

- The armpit is a typical HS region, but not every armpit nodule is HS.
- Recurrence, deep pain, discharge, scars and tunnels belong in the
  description.
- Mobility is a central part of the burden of disease here.

## Signs you can observe

Pay particular attention to recurring:

- deep, painful nodules in the armpit,
- inflamed areas that open up or discharge fluid,
- scars, hardened cords or restricted mobility,
- symptoms on both sides or together with involvement of the groin or breast fold.

A single nodule can have other causes. Recurrence and typical accompanying signs make the difference in the description.

## Which armpit observations are especially helpful

For armpit symptoms, a precise but straightforward description is worthwhile:

| Observation | How it helps at the appointment |
| --- | --- |
| right, left or both armpits | indicates the extent |
| recurring in the same area | makes the time pattern visible |
| discharge, openings or need for dressings | describes active burden |
| scars, hardened cords or suspected tunnels | describes persistent changes |

If other typical regions are also affected, mention this as well. Medical
assessment does not consider just a single spot in isolation.

## Movement belongs in the symptom description

For armpit HS, it is not enough to mention the size of a lesion. Describe whether you can raise your arm normally, whether clothing or backpack straps cause pressure, and whether sleep is difficult because of arm position.

This shows how strongly the region affects everyday life.

## What the appointment should clarify

A consultation may explore:

1. Does the recurring pattern fit HS?
2. Are there scars or tunnels that change the course?
3. How are pain, wound care and mobility taken into account?

If the flare has subsided by the time of your appointment, photos or brief notes about the course can help.

## What the assessment should protect against

A sound assessment aims to avoid two mistakes: treating recurring typical
symptoms as a series of unrelated individual events, and conversely labelling
every armpit inflammation as HS too quickly. Course and examination
belong together.

## When you should not wait

Fever, rapid worsening, sharply increasing redness, or pain that barely allows arm movement requires prompt medical assessment.

## FAQ

### Are recurring nodules under the armpits always hidradenitis suppurativa?

No. The armpit is a typical HS region, but individual nodules can have other causes. What matters medically is the type of lesions, their recurrence, scars or tunnels, and other regions affected.

### Why should I mention arm movements at my appointment?

Pain, scars or open areas in the armpit can affect lifting your arm, getting dressed, working and sleeping positions. This describes the actual burden better than the size of a single spot alone.

### What can I document for my appointment?

Note the side, recurrence, pain, discharge, scars, restricted movement and whether the groin, breast fold, buttocks or other typical regions are also affected.

## References

1. S2k Guideline for the Treatment 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/