Aplasia Cutis Congenita
definition
Aplasia cutis congenita is a condition where a newborn child is missing skin from certain areas. In about 70% of cases it is a single lesion on the scalp, but sometimes multiple lesions may appear on other parts of the body. They vary in size from 0.5cm to 10cm.
Lesions that involve only the epidermis (upper layers of skin) are shallow and usually heal over with scarring before the child is born. Deeper lesions involving the dermis, subcutaneous tissue, or rarely, the skull may be ulcerated. | 
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