Rotimi had been treating his back breakout as acne for 3 months. It wasn't acne — it was bacterial folliculitis, driven by sweat, friction, and post-workout hygiene habits. A targeted approach cleared his skin in 4 weeks.
Gym enthusiast, Ikeja. Presented with widespread follicular papules and pustules on the back, chest, and buttocks — worse after workouts. Duration 3 months. Attributed to "gym soap." Swab confirmed Staph aureus.
Bacterial Folliculitis (Staphylococcus aureus)Rotimi had been training five days a week for two years without skin problems. When the back breakout started, he assumed it was "bacne" — back acne — and bought the same salicylic acid product he'd seen recommended on fitness forums. Three months later, the bumps were spreading.
He came to Mascot Healthcare after a training partner — a medical student — looked at his back and said: "Those don't look like acne bumps. Each one is right on a hair follicle. Get a swab done."
Swab results confirmed Staphylococcus aureus. The diagnosis was bacterial folliculitis — not acne vulgaris. The cause was a combination of post-workout sweat sitting on the skin, tight synthetic workout clothing, and sharing gym benches without wiping them down.
Bacterial folliculitis produces pus-filled papules at hair follicle openings. In gym-goers, it commonly affects the back, chest, and buttocks — areas prone to sweat and friction.
Multiple small pus-filled papules centred on hair follicles across the upper and lower back.
Extension to the chest and buttocks — areas in contact with gym equipment and clothing.
New lesions consistently appeared 24–48 hours after training sessions.
Individual pustules were tender on pressure; background itch across affected areas.
Salicylic acid face wash applied to the back had no effect — pointing away from acne.
Salicylic acid 2% body wash — appropriate for comedonal acne; no antibacterial effect on Staph folliculitis.
Benzoyl peroxide 5% wash — some antibacterial effect; insufficient concentration and contact time for established folliculitis.
Changed gym soap — no change; the soap was not the primary cause.
Shea butter moisturiser — not recommended for follicular-prone skin; may have worsened follicular occlusion.
Swab confirmed Staphylococcus aureus, sensitive to standard antibiotics. Treatment: a medicated cream to individual active pustules; a medicated body wash used for 2 minutes before rinsing — to reduce surface bacterial load; and a course of oral medication for the widespread involvement.
Gym hygiene protocol: shower immediately after every workout (within 15 minutes); use an antimicrobial body wash; change into fresh clothing; wipe down gym equipment before and after use; wash gym clothing after every session; avoid synthetic tight-fitting tops during the healing period.
Follow-up in 4 weeks.
Bacterial Folliculitis — Staphylococcus aureus (swab confirmed); exacerbated by post-workout sweat and friction
Medicated cream; medicated body wash × 4 weeks; oral medication course; gym hygiene protocol
At 4 weeks: near-complete clearance of pustules. Post-inflammatory hyperpigmentation fading. No new lesions with hygiene protocol in place.
Rotimi's back cleared almost entirely within 4 weeks. Maintaining the post-workout hygiene protocol has prevented recurrence at 3 months.
Gym-related folliculitis is very common and routinely misidentified as acne. The diagnostic clue is that each lesion is centred on a hair follicle, and the distribution follows sweat-prone and friction-prone areas.
Post-workout hygiene — specifically showering within 15 minutes and changing out of sweaty clothing — is as important as antibiotic treatment in preventing recurrence.
Gym breakouts centred on hair follicles need a swab and antibiotics — not acne products.
Walk in to Mascot Healthcare, Akoka — same-day consultation, transparent pricing, 4.9★ rated.