Topical retinoids act by modifying abnormal follicular keratinization. Other topical agents, such as azelaic acid (20% cream applied b.i.d.), salicylic acid (2%; various nonprescription products ...

A 24-year-old white male presented with a 2-year history of changes to his nails. He stated that the white discoloration had never completely resolved but improved from time to time with the nails ...