Hi Welcome to HCM This is Dr Suchda Naturopath - Homeopath - MagnetoTherapist taking your query to help you . Psoriasis is an obstinate spoilt condition of skin . as you are suffering since 4 years ,I need not go into details of ,how it happens and all I want to know if scab formation is there ? I would suggest you to use Neem or Bakayan ( is tree like Neem )Decotion Prepared with 4 cups of water and 25-30 leaves . Boil till 1/4 of water remains . Apply on affected areas , daily. keep till 2 hours . Wash it with multani mitti . Don t use any soaps and drink same water 2 table spoons 3 times a day . Apply neem oil if dryness there . continue till 1 month . Take Homeopathic Radium Brom 200 1 dose fortnightly .3 times Last but not the lease ,I must say make nature your friend .It will save you all untoward diseases and now you will recover fast .We have power within our self . we have to explore and use it for our benefit . Adopt exercise ,Yoga & Pranayam -Deep breathing exercises which give us resistance to our body by burning toxins and strengthen us against diseases Do this for 30 minutes . and feel the difference . It will surely help your recover fast . Diet also need proper consideration . Have Balanced diet -more of fiber than fine fast foods , veges , frut ,soups etc, which helps keep constipation at bay the root cause of most of the illnesses Take care All The best Do come back if have any further query .