I have psoriasis. Over 80% coverage of body mass.

The thing is, I suggest the "patient" finds a doctor who knows what psoriasis really is. A GP isn't going to cut it. You'll need to find a good dermatologist. Follow the doc's advice.

Usually, alcohol is a main trigger for psoriasis. Aside from that, food that affects the patient differs for each person. Be mindful of what is ingested so notes can be taken on which food causes a relapse.

Also, lifestyle is a HUGE deal. Exercise, balanced diet, rest, stress (emotional and physical) all have some bearing on psoriasis. The problem is that most people have problems maintaining that sort of disciplined lifestyle and get upset about it. That in turn, aggravates the psoriasis. Its unfortunate but life isn't fair.

On a personal note, i have found that as long as I keep exercising (I box) and have a balanced lifestyle, psoriasis relapse aren't that severe. My relapses occur mainly because I can't give up the Guinness.

Sorry but I'm not a doctor. I can't help you with your problem because I don't have any idea what seb dematitis is.