Woolly hair naevus with triangular hairs.

This article discusses woolly hair naevus with triangular hairs. Since birth she had noticed a 'strange patch' on the scalp but she had no other physical complaints. Above the left ear was a sharply demarcated patch, approximately 5 cm in diameter, of scalp hair that was different in shape and consistency from the surrounding normal straight, fair hair. The hair in the affected area was darker in colour and the hair itself was thinner, softer and curly. There was decrease of the hair diameter. In several places thestructureofthecuticulewasdisturbed. There was twisting of the shafts, with torsion of the hair around the long axis at irregular distances. No abnormalities in blood cell count, ESR, liver function, renal function and urinalysis were noted.