A Reddish Semitransparent Tumor in an Adolescent Girl

A previously healthy 16-year-old girl presented with a lesion on her right upper arm that initially started as a small cutaneous nodule without obvious triggers and gradually developed and enlarged to form a red-colored tumor with a hard nodule inside. What is your diagnosis?

Source: JAMA Dermatology - August 9, 2023 Category: Dermatology Source Type: research