# Hidradenitis Suppurativa (Acne Inversa) vs. Folliculitis: What's the Difference?

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

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, hidradenitis suppurativa, folliculitis, differential diagnosis, hair follicles

> Folliculitis and early hidradenitis suppurativa can be mistaken for one another. This article helps distinguish superficial follicle-centred pustules from deeper, recurring HS lesions.

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 both terms come up

Folliculitis means that hair follicles are inflamed. It can look like small
pimples or pustules on hair-bearing skin. Early hidradenitis suppurativa can
also start with inflamed nodules. As a result, both conditions are often
lumped together in everyday thinking.

Medically, what matters more precisely is how the lesions look and how they
behave over time.

## What tends to point to folliculitis

Folliculitis often presents with smaller papules or pustules centred around
hair follicles. It can itch, burn, or feel tender to the touch. Depending on
the cause, it can occur on various hair-bearing areas of the body.

This doesn't mean folliculitis is always harmless. It just means its typical
appearance doesn't automatically indicate an HS diagnosis.

## What looks different in HS

Hidradenitis suppurativa becomes more likely when symptoms:

- sit deeper and are clearly painful,
- recur as nodules or abscesses,
- concentrate in typical skin fold regions,
- open up, weep, or leave scars,
- develop hardened areas, recurring openings, or tunnels (sinus tracts).

A few superficial pustules and a recurring deep nodule are different
observations. This distinction is exactly what helps during a medical
appointment.

## The course over time also matters

Folliculitis and HS can look similar at individual sites. Even involvement of
the groin or armpit isn't automatic proof of HS. What matters is whether
medical professionals recognise a recurring HS pattern: typical lesions,
typical locations, and a chronic or relapsing course.

If your skin happens to be calmer at the time of the appointment, notes or
photos of active episodes can help describe the course more clearly.

## When you should get it checked out

Recurring painful nodules in typical HS regions should be assessed by a
dermatologist, even if earlier episodes were labelled as folliculitis. If
there is rapid worsening, fever, or sharply increasing pain, prompt medical
attention is needed.

## References

1. S2k Guideline on 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. 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/
3. Folliculitis - MSD Manual Professional Edition - https://www.msdmanuals.com/professional/dermatologic-disorders/bacterial-skin-infections/folliculitis