We report the case of a 27-year-old healthy male who presented with an area of curlier and thinner hair than the rest of his scalp localized on the right parietal area. He referred that just at that location, his hair had been different since childhood, curlier than the rest. Physical examination revealed a plaque with shorter and curlier hair on an area of 10 cm in diameter on the right parietal area of the scalp. A decreased density of hair was observed. The skin on the patch was apparently healthy. There were not exclamation mark hairs or miniaturization of hair follicles. A hair pull test was negative []. A skin biopsy showed a mild perifollicular lymphocytic infiltrate, telangiectatic capillaries in the superficial dermis and several terminal hair follicles emerged in the same dilated follicular infundibulum. Interestingly, an excessive amount of normal apocrine glands were found in the deep reticular dermis. Counting of hair follicles was normal [Figure –]. Based on clinical appearance and histopathologic studies, a diagnosis of WHN was established.
A 30 year-old Brazilian woman of skin phototype IV and pregnant for 35 weeks sought medical care for presenting hyperchromic lines on both legs for 5 weeks. Hyperchromia in the axillae and groin, which had appeared earlier in the pregnancy, were concurrent complaints. There were no associated symptoms. She had a history of gestational diabetes, which was been treated with NPH insulin since the 26th week of pregnancy and was under control. It was her second pregnancy, and she denied similar alterations in the previous one. Hormonal disorders had been previously discarded by an endocrinologist. Physical examination revealed demarcation lines from the perineum to the posteromedial portion of the thighs extending to the ankles through the popliteal fossae, bilaterally and symmetrically, in the interface between a hyperchromic lateral portion and a lighter medial portion ( and ). Hyperchromic axillae and prominent linea alba were also seen.