Hi Lybrate User
If you have psoriasis
than avoid oily spicy fried salty heavy food stuffs.
You can go for Panchkarma (pentabiopurification) procedure that is virechan (purgation therapy) to get rid this problem permanently.
You can use oil psoria on effected area. For proper medication need detailed history and life style pattern so you cansult me on Lybrate on personal talk. Thanks Regards!