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.