Back and body acne, medically called truncal acne, affects the back, chest, and shoulders. Despite being common (affecting approximately 60% of people with facial acne) and often severe, it receives far less clinical attention than facial acne.
Why Truncal Acne Differs From Facial Acne
Skin thickness. The skin on the back and chest is significantly thicker than facial skin, meaning topical treatments penetrate less effectively and lesions tend to be deeper and more nodular.
Sebaceous gland density. The back and chest have extremely high sebaceous gland density, creating an environment prone to follicular plugging and C. acnes proliferation.
Mechanical factors. Tight clothing, backpack straps, sports equipment, and prolonged sweating create frictional forces (“acne mechanica”) that contribute independently of sebum.
Delayed treatment. Because truncal acne is concealed by clothing, patients often delay treatment longer than for facial acne, allowing more scarring to accumulate.
Treatment Approaches
Topical treatments for large surface areas: – Benzoyl peroxide 5–10% body wash used as a leave-on for 2–3 minutes during showering, highly effective for mild to moderate truncal acne – Salicylic acid body wash for comedonal-predominant acne – Adapalene gel on accessible areas
Systemic treatments are often more practical for extensive truncal acne: – Oral antibiotics (short-term, combined with topical retinoids) – Isotretinoin for severe or scarring truncal acne – Hormonal therapy for women
Lifestyle modifications: – Shower promptly after exercise – Avoid tight, non-breathable fabrics – Launder workout clothes after each wear
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