Perianal basal cell carcinoma treated with Mohs micrographic surgery.

: Perianal basal cell carcinoma (BCC) is a rare lesion that accounts for less than 0.08% of all BCCs. It is challenging to diagnose, as it can be overlooked or mistaken for an inflammatory dermatosis. When discovered early and treated properly, BCC is associated with low mortality and a good prognosis. Thorough total-body skin examinations and biopsy of suspected lesions found in the perianal region is recommended. We present a case of a superficial nodular perianal BCC that was discovered following a routine total-body skin examination and was treated with Mohs micrographic surgery (MMS). Patient nonattendance is also discussed.