[Dermatology and Venereology] Pimple behind the ear

Acne or acne-like lesions behind the ear are relatively common and can arise from several distinct causes. The area behind the ear contains numerous sebaceous glands and hair follicles, making it susceptible to follicular occlusion, bacterial colonization (particularly Propionibacterium acnes, now reclassified as Cutibacterium acnes), and subsequent inflammation—classic features of acne vulgaris. However, other conditions must be considered in the differential diagnosis, including folliculitis (often bacterial or fungal), contact dermatitis (e.g., from hair products, earrings, or headphones), seborrheic dermatitis, cysts (such as epidermoid or pilar cysts), or even early-stage hidradenitis suppurativa in recurrent or deep-seated cases. Rarely, atypical presentations of cutaneous infections (e.g., mycobacterial or fungal) or inflammatory conditions like sarcoidosis may manifest in this region.

Management depends on accurate diagnosis. Mild, isolated papules or pustules consistent with acne may respond to topical agents such as benzoyl peroxide or clindamycin gel. For persistent or widespread involvement, oral antibiotics (e.g., doxycycline or minocycline) or hormonal therapy (in appropriate candidates) may be indicated. If folliculitis is suspected—especially with pruritus, crusting, or surrounding erythema—culture-guided treatment is advisable. Contact dermatitis requires identification and avoidance of the inciting allergen or irritant, often supplemented by short-term topical corticosteroids. Any lesion that is rapidly enlarging, draining, painful, or fails to improve after 2–3 weeks of appropriate self-care warrants clinical evaluation to exclude deeper infection, cyst rupture, or other dermatologic pathology.

Patients should avoid picking, squeezing, or manipulating lesions behind the ear, as this increases the risk of secondary infection, scarring, and abscess formation. Gentle cleansing with a non-comedogenic cleanser and keeping the area dry—particularly after hair washing or sweating—is recommended. If lesions recur frequently or are associated with systemic symptoms (e.g., fever, malaise), further workup—including laboratory studies or biopsy—may be necessary.