Differential diagnoses include Darier's disease, AN, pityriasis versicolor, and pseudoacanthosis nigricans.1, 2, 5 The present case presented AN in association with CRP, with thicker and more velvety plaques, without reticular pattern, on the axillary and cervical areas, typical of AN, and lesions consistent with CRP on the trunk. The gene discussed is CRP; the disease is pityriasis versicolor.