If your dermatologist has asked you to use Ketomac shampoo twice a week, that is usually to control the fungal cause of dandruff, and on the remaining days, the goal is to keep the scalp clean without making it more oily or irritated. On non-medicated days, a gentle, mild shampoo (baby shampoo or a sulfate-free daily use shampoo) is usually preferred because it removes excess oil without disturbing the scalp balance or worsening dandruff. Since your scalp becomes oily very quickly, you can wash more frequently if needed, even daily, but keep Ketomac only for the scheduled days so it can work effectively. Avoid heavy oiling because it can worsen fungal growth and make the scalp feel greasier. If oiliness is very excessive, sometimes a doctor may suggest a mild scalp lotion or add-on treatment to reduce sebum production, but that depends on examination. Make sure to rinse shampoo properly and avoid leaving residue, as buildup can also increase oiliness and itching. If the problem persists despite this routine, a follow-up with your dermatologist is useful to adjust treatment strength or check for seborrheic dermatitis.