A small mole that appeared on a 60-year-old woman's nasal ala years ago has turned black and ulcerated, leading doctors to diagnose basal cell carcinoma.

A 60-year-old man was diagnosed with basal cell carcinoma, a type of cancer known for its frequent and increasingly complex recurrences, even with standard treatment.

Mr. Hai, 65, presented with a painless, non-inflamed black spot on his left cheek, which doctors diagnosed as skin cancer and treated with radical minor surgery.