Histopathology
A histopathological examination of skin lesions in mild cases of erythrocyanosis only show lymphocytic infiltration in the upper dermis. In severe cases， dilation of shallow capillaries, endothelial swelling, extravasation of erythrocytes, and occasionally throm-bosis in capillaries can also be found. In this case we described here, the epidermis did not show any abnormal features. The dermis showed dilatation of capillaries and perivascular lymphocytic infiltration (Figure 1).