Nail infections, often caused by fungi or bacteria, can affect the skin around the nails or the nails themselves. Symptoms may include redness, swelling, pain, and discoloration of the nail. Fungal infections, such as onychomycosis, are common and can lead to thickened, brittle nails. Treatment typically involves antifungal medications or antibiotics, depending on the cause. Maintaining good hygiene and keeping nails trimmed can help prevent infections. In severe cases, a healthcare professional may need to remove the infected nail to allow for proper healing.