Let’s talk about Onychomycosis (Fungal Nails) Thick, yellow, crumbly toenails are one of the most common things we see in clinic — and most of the time, it’s not “just aging”… it’s a fungal infection. 👉 What is Onychomycosis? A fungal infection of the toenail that slowly invades the nail bed, making the nail thick, discolored, brittle, and sometimes painful. It can affect one nail or multiple and usually progresses over time if untreated. How Do We Diagnose It? A proper diagnosis is key because