Healthy nails are pink and grow constantly. A big toe nail takes up to 12 months to replace itself with a new nail. Unfortunately, nail problems are common and may be caused by warts, trauma and infection. Fungal nails may require topical paints and when necessary oral antifungal agents. Other conditions may cause nails to have the appearance of a fungal infection, such as Psoriasis. You should obtain a clear diagnosis and treatment options from your podiatrist.