Dandruff that has been going on for years usually behaves more like a long-term scalp condition rather than something that can be fully cured with a short course of treatment. In most cases, it is related to seborrheic dermatitis, where scalp oil, natural yeast, and sensitivity of the skin keep triggering repeated itching and flaking. That is why medicines like KZ lotion may work for a while, but the problem tends to come back once they are stopped or used less frequently. Things like stress, sweating, seasonal changes, and heavy oiling can also make it flare again. For better control, it usually needs a maintenance routine instead of only treating during flare-ups. Medicated shampoos or lotions such as ketoconazole, zinc-based, or selenium-based products are often continued weekly or a few times a week even after improvement. Keeping the scalp clean, avoiding leaving oil for long hours during active dandruff, and washing after sweating can also reduce recurrence. If the problem is still returning despite regular care, it is better to get re-evaluated by a dermatologist, as sometimes other conditions like psoriasis can look similar and may need a different treatment approach.