In this work, the incidence of nuchal nevus flammeus was studied in 205 patients suffering from various forms of alopecia areata, as well as in a group of 555 volunteers without alopecia areata examined in our outpatient clinic. The incidence of nuchal nevus flammeus in the totalis-universalis form of alopecia areata was 58.2% (examined patients, n = 79), in ophiasis-extensive forms 22.8% (examined patients, n = 70) and in simple forms of alopecia areata 3.6% (examined patients, n = 56). In the group of 555 volunteers without alopecia areata the incidence of nuchal nevus flammeus was 4.5%. Our results show that nuchal nevus flammeus could be a valuable skin marker indicating a more severe course of alopecia areata.