A Field Fire Ulcer.

Basal cell carcinoma (BCC) is the most common skin cancer, mostly affecting areas of the skin exposed to UV radiation. Though metastasis is rare, the tumour may be locally invasive with a high recurrence rate. Pathophysiology involves neoplastic transformation of the pluripotent cells of the epidermis and follicular epithelium. 'Field fire BCC' is an uncommon type of BCC, showing concomitant crusting, ulceration and scarring which spreads peripherally with a central area of regression.