病例:男,55岁,15年前发现右足跟部局部皮肤有角质样增生,呈轻度压痛,无红、肿。7年前曾在某卫生院就诊,拟诊为鸡眼,给予外用药涂抹,但未消退。近年触碰时易出血,经久不愈,遂来院就诊。体格检查发现右足跟部与足底交界处有一长径约2.0cm的胼胝体样赘生物,其边界尚清,呈黑色,表面 Case: Male, 55 years old, 15 years ago found that the local skin of the right heel had keratinoid hyperplasia, mild tenderness, no redness and swelling. He was diagnosed at a hospital seven years ago and was diagnosed with corns. He was given an external medication but did not fade. In recent years, when he touched, he was bleeding easily and he was not cured. He came to the hospital for treatment. Physical examination revealed a 2.0-cm-long callus-like neoplasm at the junction of the heel of the right heel and the sole of the foot, the boundary of which is still clear, black, and the surface