On clinical examination, thrombosed hemangiomas (THs) are sometimes difficult to differentiate from melanoma. The Figure, A and C, shows the worrisome clinical presentation of 2 cases appearing as irregularly pigmented nodules of recent onset, located on the right leg of a 48-year-old woman (Figure, A and B) and on the back of a 28-year-old woman (Figure, C and D). Dermoscopy showed a sharply demarcated, uniform, jet-black area (Figure, B and D), corresponding to the thrombus and red (Figure, B) to blue (Figure, D) lagoons, which led to the diagnosis of TH.
Moscarella E, Zalaudek I, Buccini P, Cota C, Catrical à C, Argenziano G. Dermoscopy and Confocal Microscopy of Thrombosed Hemangiomas. Arch Dermatol. 2012;148(3):410. doi:10.1001/archdermatol.2011.1027