Figure 1: Images of the patient. (a) Hyperkeratotic erythematous papules with central plug and excoriation at the leg before the treatment. (b) Crater with crust and connective tissue fibers undergoing trans-epidermal elimination at the ulcer base (hematoxylin and eosin, 400x). (c) After 1 month of treatment with Allopurinol 300 mg/day