By Gary M. White, MD
The term endometriosis refers to the presence of endometrial tissue outside of the uterus.
A painful blue-black papule, plaque, or nodule of a woman's umbilicus which may be tender or bleed with the menstrual cycle is characteristic. It may occur spontaneously or develop in a scar after abdominal surgery of the uterus (e.g., C-section) or fallopian tubes.
Excision is the treatment of choice.
Woman was status post C-section 6 years prior. An. Bras. Dermatol 2013;88
Endometriosis presenting as a nodule in the C-section scar of a woman. Dermatology Online Journal 21;11
A 37-year-old woman with a multilobated, red-brownish nodule of the umbilicus for ten years. It occasionally bleeds during the menses. Dermatology Online Journal 17(6)
A 34 year old woman presented http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1800968/with a two year history of a tender, purplish-brown nodule at the site of a longstanding “mole” on her umbilicus. BMJ. 2007 Feb 17; 334(7589): 374.
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