A new study in the Journal of the American Academy of Dermatology found that patients treated with certain anti-diabetic medications were at reduced risk of developing psoriasis. They also found that smoking and obesity were risk factors for developing psoriasis, something we've noted before in this blog.
Smoking and overweight are just two lifestyle issues associated with psoriasis.

there are a lot of studies claiming that surroundings and heredity are one of the main caused of having Psoriasis. Obesity and smoking, I think falls on the surrounding.
Which diabetes medications?
I would be interested to know, because it would be great to kill two birds with one stone!