If the redness and scaling on your scalp have not improved after using Dermoval cream and AlphaCade shampoo for over a month, it may be time to consider other treatment options. It is important to make sure you are applying the products regularly as directed. You could try a shampoo containing 4-10% salicylic acid or one with tar if the current products are not effective. It may also be helpful to consult a physician to confirm the diagnosis and explore prescription treatments for more severe cases of psoriasis. A pharmacist can provide guidance on selecting the right product for your condition.