Aplasia cutis a naevoid abnormality which may present as absent areas of epidermis - ulceration - on the scalp
These lesions are often mistakenly thought to have been caused by birth trauma, and generally heal with a resultant atrophic scar - a bald patch.
Lesions present as well demarcated, noninflammatory, circular or oval blister or as an eroded region and are typically seen at the scalp vertex just lateral to the midline (1). Occasionally lesions can be seen on the trunk and on the extremities as well (2)
Associated congenital malformation may be seen in larger lesions. This condition may also be associated:
Management is usually conservative in small ulcers since they are self limiting (ulcers heal with scars over several weeks and bone defects close during the first year of life) Due to the risk of hemorrhage and infection multiple and large ulcers need excision and surgical closure.
Complications of aplais cutis include
Click here for an example image of this condition
Reference:
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