[Villar's nodule]

Umbilical endometriosis is a rare manifestation, most often isolated, of endometriosis, accounting for 0,5-1 % of all cases. It can be primary or secondary following surgery. It usually presents as a solid, skin-colored, red or purple-black nodule, frequently associated with pain and/or perimenstrual bleeding. Because it has a potential for malignant transformation, the gold standard of treatment is surgical removal.