Itching on back and chest , dandruff.

Hello Dr. I've been diagnosed with Dandruff and when my body temperature rises or I eat something spicy , I've itch on my back and chest and if uncontrolled it starts on arms ,  , thighs and all over body . I took the following medicines. 1. Shampoo - Ketoconazole and Piroctone Olamine (2X a week) 2. Lotion - Beclomethasone Dipropionate ( applyon scalp after bathing) 3. Cream - Clobetasol Propionate and Gentamicin (apply on hands after bathing) 4. Tablet- Levocitrizine Dihydrochloride and Montelukast Sodium (2X a day after meals) Though I have releif from dandruff and itchy scalp but as the medication period over , when my body temperature rises or I eat spicy stuff I get itch again. Please tell me the solution to this . Thank you