While plagiocephaly is cosmetic, Samuels noted that there is another, far rarer condition that causes a misshapen head, called craniosynostosis. In that disorder, the skull bones fuse prematurely, which can harm normal brain development. It usually requires surgery.
Fortunately, positional plagiocephaly is usually the culprit behind infants' flat spots, Samuels said.
Plus, she pointed out, few people actually have perfectly symmetrical heads. "Underneath our hair, most of us have lumps and bumps," she said.
Boston Children's Hospital has more on plagiocephaly.
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