treated with Onychomycosis HP:0012203 Sufficient A fungal infection of the toenails or fingernails that tends to cause the nails to thicken, discolor, disfigure, and split. Medscape: Onychomycosis: Author: Antonella Tosti, MD; Chief Editor: Dirk M Elston, MD et al.. has disease stage: Distal lateral subungual onychomycosis (DLSO), White superficial onychomycosis (WSO), Proximal subungual onychomycosis (PSO), Endonyx onychomycosis (EO), Candidal onychomycosis. Is characterised by: Disfigured nails, pain, paraesthesia, loss of dexterity, difficulty walking, standing, exercise. SCDO:0000831 Antifungal Fungal Infection Surgery