January 2022 in “Indian Journal of Dermatology/Indian journal of dermatology” Valproic acid can cause dark lines on nails.
February 2023 in “Pakistan Journal of Medical and Health Sciences” Pregnancy can cause various skin changes, with stretch marks, dark lines on the abdomen, and skin darkening being the most common.
October 2022 in “International journal of dermatology and venereology” A woman's sudden hair loss was linked to azathioprine use despite normal enzyme levels, and improved after stopping the drug and starting treatment.
86 citations,
October 2013 in “Dermatologic Clinics” Trichoscopy is a useful non-invasive method for diagnosing different hair loss conditions.
191 citations,
November 1959 in “Annals of the New York Academy of Sciences” Hair and wool have complex microscopic structures with microfibrils and varying cystine content.