Exanthema menstrualis or exanthema menstruation (English: ecchymosis menstrualis) is a skin lesion, usually located in the area of the external genitalia, but sometimes in the gluteal region and perineum, occurring after menstruation under the influence of hematocrit. May also be called blood exanthema.
It is observed from 3–4 days of menstruation to the 2–3rd day after its end. Exanthema cannot always be detected, as it can be small. However, in some cases, exanthema is visible to the naked eye and looks like small red spots that can occupy a significant area. The size of the exanthema can range from a few millimeters to several centimeters. Sometimes exanthema can be combined with itching, but this symptom is not always observed. Itching may be accompanied by mild discomfort. In some cases, exanthema is not accompanied by itching. If itching does not interfere with a person’s normal life activities, then the doctor prescribes conservative treatment, without prescribing pills - with local remedies and ointments. The lesion appears as a scarlet vascular spot, which gradually fades, turning into red edema and only then taking on the appearance of a vascular hemorrhagic inflammatory formation with a pale pink color. The doctor uses hemostatic agents to avoid heavy bleeding during menstrual exanthema. As the affected area of skin disappears from the bloodstream, vascular defects disappear - in this case, the cause occurs.