2. Immune System Malfunction
The flakiness on your skin when you have psoriasis is as a result of more healthy, normal skin cells being on the surface than what is required. The body, therefore, has to get rid of them. Not only are the skin cells more than needed, they are also produced very rapidly. There is no other option but for these skin cells to be shed on the epidermis or upper skin layer. Why would more skins cells be produced in the first place? The body thinks there has been an invasion. When you have an open wound, the body produces scar tissue while it quickly repairs the skin below it.
This suggests that the body is misreading signals. Its auto-responses in the immune system have gone haywire. Science does not know exactly why this is so but the body perceives a false intruder and ends up attacking its own healthy cells. This is why psoriasis is sometimes also called an autoimmune disease and in some cases, patients receive immune suppressors as part of their treatment.