"favus of the nails" is a dermatological condition characterized by a fungal infection affecting the nails. Synonyms for this ailment include onychomycosis, nail fungus, fungal nail infection, tinea unguium, and ringworm of the nails. These terms are interchangeably used by medical professionals to describe the same problem. The infection typically starts with discoloration, brittleness, and thickening of the nails. It may progress to nail crumbling, pain, and overall discomfort. Treatment options range from over-the-counter antifungal creams to prescription oral medications. Seeking prompt medical attention and maintaining good nail hygiene are key in managing this condition effectively.