What is the margin for excision of keratocanthoma?

The margin for excision of keratoacanthoma is typically 3-5 mm. This range is considered adequate to ensure complete removal of the tumor while minimizing unnecessary removal of surrounding healthy tissue. Keratoacanthomas are often well-defined and, if excised with this margin, yield excellent outcomes in terms of cosmetic results and lower recurrence rates.

Larger margins may lead to unnecessary surface trauma and complications, whereas narrower margins risk leaving residual disease, which can lead to recurrence. The chosen margin balances the need for complete excision with consideration for minimizing morbidity and maximizing cosmetic appearance. Thus, opting for a 3-5 mm margin reflects a standard practice in dermatologic surgery for keratoacanthomas.