We herein present a 16-year-old boy who had multiple mildly itchy, erythematous papules with confluence in a linear arrangement on his left thumb for 6 months.

• 摘要本文报告一位16岁男孩，在他的左手大姆指上有许多微痒的红色融合线性丘疹，这病变已持续了半年。