Which of the following conditions should be avoided when providing nail treatments?

Avoiding onychomycosis during nail treatments is crucial because this fungal infection affects the nails and can lead to further complications if not properly managed. Onychomycosis can cause the nails to become discolored, thickened, and brittle, which not only impacts the aesthetic appearance but also raises the risk of spreading the infection to other nails or individuals.

In a nail treatment setting, addressing onychomycosis requires specific medical intervention rather than cosmetic treatment, as the focus should be on eradicating the infection first. Providing services over infected areas can lead to exacerbating the condition or transferring the infection.

While the other conditions listed might have implications for treatment, onychomycosis specifically relates directly to nail health and safety, making it essential to fully avoid treatment until the infection is resolved.