|Classification and external resources|
|ICD-10||L30.5 (ILDS L30.590)|
|eMedicine||ped/1813 derm/333 emerg/425|
Pityriasis alba is a common skin condition mostly occurring in children and usually seen as dry, fine-scaled, pale patches on the face. It is self-limiting and usually only requires use of moisturizer creams.
The condition is so named for the fine scaly appearance initially present (pityriasis) and the pallor of the patches that develop (while "alba" is Latin for white, the patches in this condition are not totally depigmented).
Any dermatitis may heal leaving pale skin, as may excessive use of corticosteroid creams used to treat episodes of eczema. The hypopigmentation is due to both reduced activity of melanocytes with fewer and smaller melanosomes.
The condition is most often seen in children between the ages of 3 and 16 years and is more common in males than females. It may occur more frequently in lighter-skinned patients, but is more apparent in those with darker complexions.
Up to a third of US school children may at some stage have this condition. Single-point prevalence studies from India have shown variable rates from 8.4%, to 31%. Other studies have shown prevalence rates in Brazil of 9.9%, Egypt 13.49%, Romania 5.1%, Turkey 12% where higher rates were seen in those with poor socioeconomic conditions, and just 1% in school children in Hong Kong.
Symptoms and signs
The dry scaling appearance is most noticeable during the winter as a result of dry air inside people's homes. During the summer, tanning of the surrounding normal skin makes the pale patches of pityriasis alba more prominent.
Individual lesions develop through 3 stages and sometimes are itchy:
- Raised and red - although the redness is often mild and not noticed by parents
- Raised and pale
- Smooth flat pale patches
Lesions are round or oval, of 0.5–2 cm in size although may be larger if they occur on the body (up to 4 cm), and usually number from 4 or 5 to over 20. The patches are dry with very fine scales. They most commonly occur on the face (cheeks), but in 20% appear also on the upper arms, neck, or shoulders.
The diagnostic differential should consider tinea and vitiligo amongst other causative factors.
No treatment is required and the patches in time will settle. The redness, scale and itch if present may be managed with simple emollients and sometimes hydrocortisone, a weak steroid, is also used.
As the patches of pityriasis alba do not darken normally in sunlight, effective sun protection helps minimise the discrepancy in colouration against the surrounding normal skin. Cosmetic camouflage may be required.
The patches of pityriasis alba may last from 1 month to about one year, but commonly on the face last a year.
- Vitiligo which, by comparison, causes total loss of skin colour or on the face tends to occur around the mouth and eyes.
- List of cutaneous conditions
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