Nail problems can occur due to fungal infection, injury, psoriasis, or other skin conditions, and the treatment depends on the exact cause. Keep the affected nail clean and dry, avoid biting or trauma, and do not try to remove or cut the damaged nail yourself. A dermatologist can examine the nail closely and may advise tests if needed, then prescribe appropriate treatment such as antifungal medicines, medicated creams, or other therapies based on the diagnosis. Early and correct treatment helps prevent worsening and improves nail recovery over time.