India, Oct. 18 -- This is not your regular chocolate. Chocolate cysts contain dark, old blood. They indicate endometriosis, a medical condition in which endometrium-like tissue grows outside the uterus. Several symptoms are associated with the condition, and removing these cysts may be necessary at times. A chocolate cyst results from endometriosis, a condition in which tissue that normally lines the inside of the uterus (the endometrium) grows outside the uterus. When this tissue attaches to the ovary, it continues to function just as it would inside the uterus; during the menstrual cycle, it thickens and bleeds every month. Since this blood remains trapped within the ovary and cannot escape, it accumulates over time, forming a cyst.

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