thanks for choosing health care magic.See when ever there is some deficiency of vitamins
the skin inside the mouth becomes cracked or it becomes dry and give rise to the problem you have.This deficiency could be nutritional or some time due to drugs(medicines) that you are taking.So take more green leafy vegetables and salads.Food rich in bcomplex and folic acid
.You can also take vitamin supplement tablets from some time after consulting your doctor.As far as psoriasis
is concerned keep in contact with dermatologist
as it requires long term and continuous treatment.