That could mean a lot of stuff. It could mean that Psoriasis is caused by something you eat in particular.
Another thing is this: when you fast, your body releases Sirtuins. These are compunds that promote cellular healing and protection against external and internal stressors. Thats why fasting helps to alleviate a lot of ailments, at least temporarily. This Sirtuins topic is very interesting, you should read more about it.
do you eat gluten??
have you ever tried a longer fast?
Do you control your exposure to EMF?
(in a lot of cases, this is the
main cause of psoriasis)