Hi there. Your problem requires the attentions of a dermatologist
on the ground. It could be any of the papulosquamous skin diseases aka psoriasis (inverse) or atopic dermatitis
from your description. It may require a skin biopsy
& or pathc tests to confirm & the treatment will be based on the pucca diagnosis. I dont know how much a liver tonic is going to help you but Good luck! Do add an antihistamine like fexofenadine
180mg in the interim. cheers!