If a punch biopsy is taken, a stitch (suture) or 2 may be placed and will need to be removed 6–14 days later. Sampling a small piece of skin by using a flexible razor blade, a scalpel, or a tiny cookie cutter (called a “punch biopsy”). ![]() Numbing the skin with an injectable anesthetic.If your physician suspects a keratoacanthoma, he or she will first want to establish the correct diagnosis by performing a biopsy. Therefore, prompt diagnosis and treatment are recommended. Additionally, rare forms of keratoacanthoma may spread (invade) aggressively below the skin level and into the lymph glands, and your doctor has no way to tell this type from the more common form. ![]() However, they may cause significant damage to the skin and underlying layers of tissue as well as psychological distress. ![]() If left untreated, most keratoacanthoma spontaneously disappear (resolve) within 6 months, leaving a depressed scar.
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