<unk>  is a common skin condition mostly occurring in children and usually seen as dry, fine scaled, pale patches on their faces. It is self limiting and usually only requires use of moisturiser creams.
The condition is so named for the fine scaly appearance initially present (pityriasis) and the palor of the  patches that develop (whilst "alba" is Latin for white, the patches in this condition are not totally depigmented).
Pityriasis alba
Alopecia mucinosa
Pityriasis rosea
Phytophotodermatitis
Pityriasis rubra pilaris
Pityriasis amiantacea
Urticaria pigmentosa
Poikiloderma of civatte