Intralesional methotrexate treatment for keratoacanthoma tumors: a retrospective case series.

Background: Intralesional methotrexate (IL-MTX) is an effective treatment for keratoacanthoma.

Objective: We sought to determine the response rates and adverse events in KA treated with intralesional methotrexate.

Methods: All cases of KA treated with intralesional methotrexate at our institutions from 2001 to 2009 were systematically reviewed.