Folliculitis: Types, Causes, and How to Treat Infected Hair Follicles
Medically reviewed by Dr. Celina Kazumi Iwasa, MD, Board-Certified Dermatologist · Last updated June 2026
Folliculitis — inflammation of hair follicles — is one of the most common skin conditions encountered in clinical practice. It can be caused by bacteria, fungi, viruses, or even mechanical irritation, and it ranges from a few mildly annoying bumps to a widespread, uncomfortable eruption. The challenge with folliculitis is that multiple different causes can produce nearly identical-looking rashes, and choosing the wrong treatment (antibiotics for fungal folliculitis, for example) is a common and frustrating mistake.
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Quick Answer
Folliculitis is a common skin condition where hair follicles become inflamed or infected, resulting in clusters of itchy, red, pimple-like bumps. It can appear anywhere hair grows and is usually caused by bacteria, but fungi, viruses, or irritation like frequent shaving can also be to blame. While mild cases often clear up on their own with good hygiene and warm compresses, deeper or persistent infections may require targeted medical treatments such as antibacterial washes or prescription medications. Always consult a healthcare professional for an accurate diagnosis.
Symptoms
- Clusters of small red bumps around hair follicles
- White-headed pimples around follicles
- Itching or tenderness
- Painful, tender skin
- Pus-filled blisters that break and crust
Severity & Progression
What Causes Folliculitis
Folliculitis occurs when hair follicles become inflamed — either from infection or from non-infectious irritation. Understanding the cause is critical because treatment differs dramatically.
Bacterial folliculitis: Most commonly caused by Staphylococcus aureus. Bacteria enter damaged or occluded follicles, producing superficial pustules. Risk factors include shaving, friction from tight clothing, excessive sweating, and nasal S. aureus carriage. MRSA folliculitis is increasingly common and may not respond to standard antibiotics.
Fungal folliculitis (Malassezia folliculitis): Often misdiagnosed as acne and mistreated with antibiotics — which actually worsen it by reducing bacterial competition with the fungus. Caused by Malassezia yeast, which thrives in hot, humid conditions. Produces uniform, itchy, small papules and pustules on the chest, back, and shoulders. Key diagnostic clues: itch (acne doesn't typically itch), lack of comedones, worsening with antibiotics, and improvement with antifungals.
Hot tub folliculitis: Caused by Pseudomonas aeruginosa in inadequately chlorinated hot tubs, pools, or water slides. Produces itchy, red papules and pustules 24–48 hours after exposure, in areas covered by the swimsuit (where wet fabric trapped contaminated water against the skin). Usually self-limiting.
Mechanical folliculitis: Razor bumps (pseudofolliculitis barbae) occur when shaved hair curls back and penetrates the skin, causing an inflammatory foreign-body reaction. Very common in men with curly hair, particularly men of African descent.
Gram-negative folliculitis: Occurs in patients on prolonged oral antibiotics for acne. Resistant gram-negative bacteria colonise the nose and spread to the face, producing sudden clusters of pustules.
How Folliculitis Differs from Similar Conditions
Several conditions can look similar. Here's how to tell them apart — though a healthcare professional can provide a definitive diagnosis.
| Condition | Key Difference from Folliculitis |
|---|---|
| Acne | Comedones (blackheads, whiteheads) are present — folliculitis does NOT produce comedones. Acne is driven by sebum, P. acnes, and hormones. Distribution on face, chest, back. |
| Keratosis Pilaris | Firm, rough, keratin-plugged bumps without pus. Not inflamed or infected. Upper arms and thighs. Present since adolescence. |
| Insect Bites | Scattered, itchy papules not centred on follicles. Often on exposed skin. No relationship to shaving, clothing, or sweating. |
| Miliaria (Heat Rash) | Tiny, non-follicular vesicles or papules in areas of occlusion. Caused by sweat duct blockage, not follicular infection. Resolves with cooling. |
| Herpes Simplex | Grouped vesicles on an erythematous base, often preceded by tingling. Recurs at the same site. Not follicular. |
Treatment: What Actually Works
Bacterial folliculitis (mild): Antibacterial wash containing benzoyl peroxide (2.5–5%) or chlorhexidine used daily on affected areas. Topical mupirocin or fusidic acid for localised pustules. Most mild cases resolve with improved hygiene alone.
Bacterial folliculitis (moderate-severe): Oral antibiotics — flucloxacillin, cephalexin, or doxycycline for 7–10 days. If recurrent, check for nasal S. aureus carriage and treat with mupirocin nasal ointment.
Fungal folliculitis (Malassezia): Oral fluconazole (200mg weekly for 2–4 weeks) or itraconazole (200mg daily for 1–2 weeks) is first-line. Topical ketoconazole wash or selenium sulfide body wash as adjunctive treatment and maintenance. If a patient's 'acne on the chest and back' isn't responding to antibiotics, think fungal.
Hot tub folliculitis: Usually self-resolves within 7–14 days without treatment. Ciprofloxacin is an option for severe or persistent cases. Prevention: ensure proper chlorination/pH of hot tubs.
Razor bumps (pseudofolliculitis barbae): Stop shaving (grow a beard if possible) or switch to an electric clipper that doesn't cut below the skin surface. Chemical depilatories or laser hair removal provide long-term solutions. If shaving is required, shave with the grain, use a single-blade razor, and apply a glycolic acid preparation post-shave.
Prevention for all types: Wear loose-fitting, breathable clothing. Shower after sweating. Avoid sharing razors. Change out of wet swimwear promptly.
Check your products: See if your shampoo or skincare contains these ingredients:
When Folliculitis Is Actually Something Else
If 'folliculitis' doesn't respond to two weeks of appropriate treatment, reconsider the diagnosis. Pityrosporum (Malassezia) folliculitis is the most commonly missed diagnosis — it's frequently misdiagnosed as acne and treated with antibiotics that make it worse. The absence of comedones and the presence of itch are strong clues. In immunosuppressed patients, consider eosinophilic folliculitis (HIV-associated) or disseminated fungal infection.
Folliculitis Across Skin Types and Hair Types
In darker skin, folliculitis lesions are often hyperpigmented, and post-inflammatory hyperpigmentation after healing can be more distressing than the folliculitis itself. Pseudofolliculitis barbae (razor bumps) is disproportionately common in men of African descent due to the tightly curved hair shaft, which is more likely to re-enter the skin after shaving. This isn't a hygiene issue — it's a structural hair characteristic. Laser hair reduction with Nd:YAG laser (the only laser safe for darker skin tones) is an effective long-term solution.
Self-Care Tips
- Use clean razors and proper shaving technique
- Shower after sweating or swimming
- Wear loose, breathable clothing
- Avoid sharing razors or towels
- Apply warm compresses to affected areas
When to See a Doctor
If condition spreads, doesn't improve with self-care, if you develop fever, or if lumps become large and painful
Frequently Asked Questions
What does folliculitis look like, and how is it different from acne?
Folliculitis typically looks like clusters of small red bumps or white-headed pimples, specifically surrounding hair follicles. It often feels itchy, tender, or painful. While it looks very similar to acne, folliculitis is directly tied to the hair follicle and is frequently caused by a bacterial or fungal infection, whereas acne is driven by clogged pores due to oil and dead skin cells.
Why did I get a rash after using a hot tub?
A rash after soaking is often hot tub folliculitis, caused by the Pseudomonas bacteria. It thrives in pools and hot tubs where chlorine levels are poorly maintained. The rash usually appears as itchy red bumps within a couple of days of exposure. Although it often clears up on its own, showering immediately after swimming and washing your swimsuit can help prevent it.
How do I treat those annoying bumps I get after shaving?
Shaving bumps, or pseudofolliculitis, happen when shaved hairs curl back into the skin, causing inflammation. You can manage them by taking a break from shaving, using warm compresses, and washing with an over-the-counter antibacterial cleanser like benzoyl peroxide. To prevent them, use a clean, sharp razor, shave in the direction of hair growth, or consider long-term solutions like laser hair removal.
Is folliculitis contagious? Can I catch it from someone else?
Most forms of everyday folliculitis caused by irritation or your body's natural skin fungi are not contagious. However, if the condition is caused by a bacterial infection like Staphylococcus, the bacteria can be spread through close skin-to-skin contact or by sharing infected items. To be safe, avoid sharing razors, towels, or washcloths with someone who has an active outbreak.
When should I see a doctor for an infected hair follicle?
You should see a healthcare professional if your symptoms do not improve after a few days of self-care, if the rash begins spreading, or if you develop a large, painful, pus-filled lump. These signs suggest a deeper infection, such as a boil or cellulitis, which may require oral antibiotics or professional drainage to heal properly and prevent complications like scarring.
Does my workout gear or clothing cause these spots?
Yes, tight athletic wear and non-breathable clothing can contribute to folliculitis. Tight clothing rubs against the skin, causing friction that damages hair follicles. When combined with sweat and dead skin cells, this creates an ideal environment for bacteria and fungi to thrive. To prevent this, wear loose, breathable fabrics and shower immediately after heavy sweating or intense physical activity.
Why does my folliculitis keep coming back?
Chronic or recurring folliculitis can happen for a few reasons. You might be dealing with a persistent fungal infection misdiagnosed as standard acne, or the bacteria on your skin might need a stronger prescribed treatment. Underlying factors like diabetes, a weakened immune system, or long-term medication use can also make you more susceptible. A doctor can help investigate the true root cause.
How can ScanSkinAI help with folliculitis?
ScanSkinAI serves as an educational screening aid to help you understand common skin spots and rashes, including those that look like folliculitis. By analysing your images, the AI can suggest potential visual matches to guide your next steps. However, it cannot provide a medical diagnosis. You should always consult a doctor or dermatologist to confirm the condition and receive an exact treatment plan.
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Medical References
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Medical Disclaimer: This information is for educational purposes only and is not intended as medical advice. The content on this page should not be used to diagnose or treat any health problem. Always consult with a qualified healthcare professional for proper medical evaluation, diagnosis, and treatment of your condition.