Histopathology showed moderate hyperkeratosis and rete ridge elongation with the epidermal thinning above the papillar layer and a few melanophages in the dermis.

腋下、腹、房下色素沉着15年,无明显自觉症状。

Histopathologic examination showed hyperkeratosis of epidermis, increased thickness of the granular layer and dilation of subpapillary vessels filled with red blood cells.

组织病理学检查示表皮角化度,呈头瘤样增生,颗粒层增厚,真皮头见大量增生扩张的毛,腔内含红胞,周围淋巴胞浸润。