A 6-year-old girl born to nonconsanguineous parents presented with abnormal patch of hair since 4 years. Her parents noticed circumscribed patch of curling and coiling of hair along with change in texture over the vertex of scalp. Birth and development history were normal. Family history was negative for such condition.\nOn examination, there was solitary cicrcumscribed patch of size 5 cm × 6 cm over vertex []. Hair over the patch had an altered texture, light in color, thinner, and tightly coiled. The hair in other areas of scalp was normal. Skin over the patch was normal. Linear epidermal nevus was present over the chin extending to the neck there [] was no evidence of palmoplantar keratoderma and precocious puberty. Based on the above findings, we arrived at a diagnosis of wooly hair nevus.\nLight microscopy of hair revealed irregularities of the cuticle and twisting of hair []. Dermoscopy revealed snake crawl appearance and knotting of hair []. Diagnosis of woolly hair nevus was made, and parents were counseled for benign nature of the condition.
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.