Psoriasis is a relatively rare condition. And only 2 to 3 of the population suffers from it. It’s caused when the skin cells replace themselves faster than the usual rate. In some cases, your body can take just a few days to replace the same amount of skin cells a nonsufferer will produce in 28 days. Psoriasis can be confused with dandruff. And that’s because one of the major symptoms is flaking. However, psoriasis flakes tend to be more severe than dandruff and can be recognized by their more silver color.