Histiocytosis: Skin manifiestation
Cutaneous abnormalities are present in almost 80% of patients, frequently
as the first sign. Skin lesions may be the only evidence of the disease or
may be part of systemic involvement. The eruption may be extensive, involving
the scalp, face, trunk, buttocks, and intertriginous areas. Lesions consist
of closely set petechiae and yellow-brown papules topped with scale and crust.
The papules may coalesce to form an erythematous, weeping or crusted eruption
mimicking seborrheic dermatitis.