question: hi i have scalp psoriasis ..I was using topical shampo...I recently went to a water theme park...after that iam finding my scalp psoraisis is returning and white patches are coming ..though noe it is in mil state...Also i have psoriasis in my elbow and knee . ...Pls suggest we what need to be done to prevent it...What ointments, medicines..i should use for my scalp and knees