Seborrhea, also known as seborrheic dermatitis, affects children under 2, but especially infants up to 3 months. The cause is unknown, but is thought to be a disturbance in the skin's production of sebaceous matter and sweat. Unlike atopic eczema, the rash is not particularly itchy. The rash is ...

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This boy of six weeks has seborrheic dermatitis. He has a small, dry, flaking rash on his face and scalp.