Histologically, there is an increase in pigmentation in the basal layer. Nevus spilus is a flat brown patch within which are dots of dark brown or blackish-brown areas of hyperpigmentation (Figure 4).

Epidermal lesions include ephelides, café-au-lait macules, Becker's nevus, and nevus spilus. Incontinentia pigmenti, hemochromatosis, and fixed-drug eruptions are examples of dermal melanotic ...