is difficult to treat but not impossible.
u need to take treatment from dermatologist
it will take time but u need to stick one doctor so he can access well.
treatment like isotretinoin
and other immuno modulator drug give good result.
cream with salicylic cream and steroid
u need to regular application of the good moisturizer cream
drink more water and use moist soap only
dont use hot water to bath as it will increase ur condition .