I have had psorisis since the birth of my son in 1978, mostly my knees, elbows, shins. These areas are very tough to treat because it has been there so long. I noticed about 2 years ago that every time I got a new cut, or scratch after the healing there would be a lesion of psoriasis. These areas however are easy to treat with just about any ointment the Dr. has given me over the years. The only thing that has truly helped is when I am put on prednisone when my aysthma flares up. Then everything clears up unfortunetly it is temporary I did come across something in walgreens called SKIN ZINC it is a 2 part system a spray and then a lotion and when I use it the way your supposed to it really helps a lot