Quick answer. Folliculitis is inflammation of the hair follicles that shows up as small red bumps or pus-filled spots, often triggered by bacteria, sweat or shaving. Most cases are mild and settle with good skin hygiene, but spreading, painful boils with fever need a doctor.
Folliculitis is one of the most common skin complaints in Singapore’s hot, humid climate, where sweat, friction and frequent shaving all irritate the hair follicles. It typically appears as a cluster of small red bumps or whiteheads around hairs on the scalp, beard area, chest, back, buttocks or legs, and it can be itchy, tender or simply unsightly.
The good news is that most folliculitis is superficial and self-limiting. This guide explains what folliculitis is, why it happens, how a doctor tells it apart from acne, and the treatment and prevention steps that work, so you know when home care is enough and when to see a dermatologist.
At a glance
| Type | Usual cause | Typical features |
|---|---|---|
| Bacterial folliculitis | Staphylococcus bacteria | Itchy red bumps or pustules around hairs, often on beard, legs or buttocks |
| Hot tub folliculitis | Pseudomonas from poorly maintained pools or spas | Itchy bumps 1 to 2 days after using a hot tub, mainly under swimwear areas |
| Razor bumps (pseudofolliculitis) | Ingrown hairs after shaving | Bumps in shaved areas such as beard, neck or bikini line |
| Fungal (Malassezia) folliculitis | Yeast overgrowth in sweaty, oily skin | Uniform itchy bumps on chest, back and shoulders, common in humid weather |
| Boil or abscess | Deeper bacterial infection of a follicle | Larger, painful, firm red lump that may come to a head and drain pus |
What is folliculitis?
Folliculitis is inflammation or infection of a hair follicle, the tiny pocket of skin from which each hair grows. When a follicle becomes irritated or infected, it swells into a small red bump, often topped by a whitehead of pus, with the hair sometimes visible in the centre.
It can occur anywhere hair grows, so the scalp, face, neck, chest, back, armpits, buttocks, thighs and legs are all common sites. In Singapore’s warm, humid environment, trapped sweat and tight clothing make it especially frequent. Most folliculitis is superficial, mild and clears within a week or two, but deeper infection can produce painful boils.
Symptoms & signs
Folliculitis usually looks like a crop of small bumps centred on hair follicles. Typical features include:
- Clusters of small red bumps or white-tipped pustules around hairs
- Itching, prickling or mild tenderness of the affected skin
- Bumps that may crust over as they heal
- Patches commonly on the beard area, scalp, chest, back, buttocks or legs
- In deeper cases, a larger painful red lump (a boil) that may drain pus
Unlike a brief heat rash, folliculitis bumps are clearly centred on individual hairs. Widespread, painful or recurring spots, or any spot accompanied by fever, deserve medical review.
Causes & risk factors
Folliculitis happens when hair follicles are damaged and then irritated or invaded by bacteria or yeast. Common causes and triggers include:
- Bacterial infection, most often by Staphylococcus, sometimes Pseudomonas from poorly chlorinated hot tubs or pools
- Shaving, waxing or plucking, which can cause ingrown hairs
- Friction from tight clothing, sportswear or backpacks
- Heavy sweating in hot, humid weather, a constant factor in Singapore
- Occlusive oils, heavy moisturisers or thick make-up that block follicles
- Fungal overgrowth (Malassezia yeast), favoured by sweaty, oily skin
- Reduced immunity, diabetes, or long-term use of certain antibiotics or steroids
How it's diagnosed
Folliculitis is usually a clinical diagnosis, meaning a doctor can recognise it by looking at the skin and asking about your habits, such as shaving, sport, recent swimming or hot tub use, and what products you apply.
If the rash is widespread, recurrent, not responding to treatment, or the doctor suspects a fungal cause, a simple swab of the pus or a skin scraping may be sent to the laboratory to identify the organism and guide the right treatment. This matters because bacterial and fungal folliculitis are treated differently, and treating fungal folliculitis with antibiotics alone tends to make it worse.
Treatment options
Most superficial folliculitis settles with simple measures and good skin hygiene. Treatment depends on the cause:
- Self-care: warm compresses, gentle washing with a mild antibacterial cleanser, and avoiding shaving or friction over the area until it clears
- Bacterial folliculitis: a topical antibiotic or antiseptic; oral antibiotics for more extensive or stubborn cases
- Fungal folliculitis: antifungal washes or creams, and sometimes oral antifungal tablets
- Razor bumps: changing shaving technique, using a clean sharp blade, shaving with the grain, or pausing shaving while the skin heals
- Boils and abscesses: larger collections of pus may need to be drained by a doctor, along with antibiotics
To prevent recurrence, keep skin cool and dry, change out of sweaty clothes promptly, shower after exercise, and avoid sharing razors or towels. There is no reliable Singapore cost basis to quote for treating folliculitis, as it is usually managed with low-cost creams or a short course of medication; your clinic can advise on consultation and medication fees.
When to see a doctor & which specialist
See a doctor if the rash spreads, keeps coming back, does not improve after a week of self-care, or if you have diabetes or a weakened immune system. Seek medical care promptly if you develop a painful boil or abscess, large areas of redness and swelling, or a fever, as these can signal a deeper or spreading infection. A spreading skin infection with fever and feeling unwell warrants urgent attention at a clinic or A&E, and in an emergency you can call 995.
For persistent, recurrent or severe folliculitis, a skin specialist can confirm the cause, run swabs and tailor treatment. You can find one through our directory of dermatologists in Singapore.
Related guides
- Best Dermatology Clinics in Singapore — our editorial shortlist
- dermatology clinics directory
- Heat rash
- Sebaceous cyst
- Overactive bladder
- Keloid scars
- Bursitis
Sources
- Mayo Clinic – Folliculitis
- NHS – Folliculitis
- HealthHub Singapore – Skin conditions
- DermNet – Folliculitis
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