Homeopathic therapeutics for Onychia symptoms from ABC Manual of Materia Medica and Therapeutics by G H Clarke….

Antisyphilitic treatment usually required.

Nitrate of lead, powder form or in ointment or glycerin, locally.

George Hardy Clark
Clark, George H. (George Hardy) 1860-1941 was the author of: Homeopathic Treatment of Asthenopia; Lee and Clark's Cough and expectoration : a repertorial index of their symptoms; The A B C Manual of Materia Medica and Therapeutics; A system for the care and training of children; The Black Plague and Its Control.