HI if you are allergic to steroids
you can use products containing Tar and salicylic acid
like polytar shampoo or fongitar shampoo.you can also use ketoconazoleshampoos.TO remove thick plaques you should use 10% salicylic acid mixed with mineral oil coer with a shower cap and leave it overnight and then wash off in the morning.
Vitamin D analogues like calcipotriene
lotion can be used for maintenance
if problem persists then systemic treatment can be considered like methotrexate