Infantile pityriasis alba and comorbid disorders

Pityriasis alba is a common cutaneous disorder characterized by asymptomatic hypopigmented patches on the face, neck, trunk and proximal extremities of children and young adults. Its pathogenesis has not been definitely clarified. Pityriasis alba is considered to be a low-grade eczematous dermatitis and is regarded as a minor feature of atopic dermatitis. Possible comorbid disorders described in association with pityriasis alba are nutritional deficiency, anemia and parasitic infestations; however, these are exclusively observed in children of poor socioeconomic conditions. In the past, a pathogenic implication of several microorganisms, in particular Gram-positive bacteria, has repeatedly been proposed but never confirmed. Pityriasis alba has no reliable treatment, but it usually resolves with time. Emollients, mild topical steroids and pimecrolimus may aid to accelerate the repigmentation.