Longstanding Eruptive Keratoacanthoma of the Neck Arising From a Tattoo

Keratoacanthoma (KA) is a cutaneous neoplasm arising from follicular hair cells on sun exposed regions of the skin, particularly the head and neck. Their pathology remains controversial thus distinguishing between KA and squamous cell carcinoma (SCC) has proven to be difficult over the years. Some expert pathologists consider KA a precursor to SCC, while others define it as a well-differentiated variant of SCC or an abortive malignancy with low potential of progression to a full invasive squamous cell carcinoma