Pityriasis Alba

Abstract

Pityriasis alba is a common skin disorder which is more apparent in children with skin of color. It has been described as related to an atopic diathesis, though all patients do not have frank atopic dermatitis by the Hanifin criteria (Hanifin and Rajka 92:44–47, 1980). Clinically, the condition presents with hypopigmented patches or thin plaques with fine scales predominantly on the face, neck, and upper arms. Many patients present in summertime because of increased contrast between affected and unaffected skin with tanning. The condition may be misdiagnosed or erroneously attributed to infective processes such as tinea faciei or more chronic pigmentary problems such as vitiligo, resulting in significant psychological distress. Education regarding the underlying etiology and emphasis on the benign nature of pityriasis alba are key elements of intervention, in tandem with typical treatment elements: lubrication, sun protection, and, depending on severity, topical steroids or calcineurin inhibitors. Clinical presentation, differential diagnoses, histopathology, and treatment will be discussed in further detail in this chapter.