title: Retinoid acid in the treatment of hyperkeratosis lenticularis perstans Flegel.
mesh_terms: D000284:Administration, Oral; D000368:Aged; D004817:Epidermis / Q000648:ultrastructure; D005050:Etretinate / Q000009:adverse effects / Q000627:therapeutic use*; D005260:Female; D006261:Headache / Q000139:chemically induced; D006801:Humans; D007642:Keratosis / Q000188:drug therapy* / Q000473:pathology; D008854:Microscopy, Electron; D014212:Tretinoin / Q000031:analogs & derivatives*
chemical_list: D014212:Tretinoin; D005050:Etretinate