Thanks for writing here.
Psoriasis is a skin disorder occuring because of disturbed skin cell cycle.
It responds to treatment but relapses are common.
You have to accept this.
There is no permnant cure for it.Topical steroid
lotions like propysalic and shampoos like ionax t works well in scalp psoriasis
In severe cases drugs like methotrexate
It will be better to consult a dermatologist
and take the treatment under his guidance.
Hope this will help you.Take care.