An adult man presented with a localized pustular eruption on the scalp (Figure). He complained of pain and burning at the site. Prior to the onset of the lesions, he had undergone surgery for the removal of a large squamous cell carcinoma on the scalp. The defect was covered with a skin graft. Three months after the surgery, he developed a pustular eruption on the graft. He was initially treated for several months with topical antibiotics and bland dressings, with no improvement.Physical examination revealed a localized eruption consisting of erosions and nonfollicular confluent pustules, covered by yellowbrown keratotic crusts, alternating with atrophic areas. Bacterial cultures of several pustules were sterile, and the biopsy showed nonspecific inflammatory reaction. Based on the history of recent surgery, the clinical appearance, the negative cultures, and the nonspecific biopsy, the diagnosis of erosive pustular dermatosis of the scalp (EPDS) was established. The patient was started on topical corticosteroid treatment followed by significant improvement of the lesions within 2 weeks.An inflammatory dermatosis, EPDS was first described in the late 1970s by Burton 1 and Pye et al. 2 It usually affects elderly patients with atrophic sun-damaged skin, often with coexistent or previously treated actinic keratoses and/or invasive squamous or basal cell carcinoma. Local trauma and surgery, skin infections such as herpes zoster, and topical treatments like imiquimod may also trigger the disease. Patients present with yellow-brown crusts, erosions, pustules, and lakes of pus on the scalp. The end result is scarring alopecia, which is secondary to chronic inflammation with subsequent destruction of the hair follicle. 3 Since EPDS is a clinical diagnosis, microbial, histologic, and immunofluorescence studies may be necessary to exclude cutaneous infections, pemphigus foliaceous, nonmelanoma skin cancer, and folliculitis decalvans. Characterized by chronic, ongoing inflammation, EPDS might require long-term management. Current recommendations suggest as a first-line therapy high-potency topical corticosteroids or topical calcineurin inhibitors (tacrolimus). Secondline therapies include oral corticosteroids, topical calcipotriol, oral acitretin, and dapsone gel. Curettage debridement with electrodesiccation has also been reported to be beneficial in some cases. 4