False about pityriasis alba: (AIIMS May 2014)
|A||No active treatment required|
|B||Common in children|
|C||Variant of vitiligo|
|D||Common over the face|
Variant of vitiligo
1). Pityriasis alba occurs mainly in children. The lesions are hypopigmented, round or oval, macular or slightly elevated patches with fine adherent scales.
2). Sometimes they may be mildly erythematous and relatively well defined but lack a sharply marginated border.
3). Lesions occur on the face, neck, upper trunk, and proximal arms. Itching is minimal or absent.
4). Etiology is unknown but the eruption is exacerbated by dryness and is often regarded as a mild form of eczema.
5). It is often 'misdiagnosed' as tinea versicolor or corporis, each of which can be readily excluded by KOH examination of surface scales.
6). Lesions wax and wane and eventually disappear.
7). Application of a lubricant may be helpful and if pruritus is troublesome a topical 1 % hydrocortisone cream applied 8 or 6 hourly may be useful. Normal pigmentation reappears in weeks to months.
Extra Edge: Pityriasis Alba
1). Non-specific dermatitis manifest as ill-defined hypopigmented round / oval macule with fine scaling on face of child
2). More common in winter.
3). Disappears spontaneously by puberty.