My $0.02 I tried these biologics for eczema - 50k baht a month but it was on medical insurance (NOT Thai) and while it seemed to work it could have cleared up by it self (I get "flare-ups").
I went to the dermatologist here who suggested UV treatment - 20 or 30 sessions at 700 baht a go. Again it got better but maybe again it just cleared up on its' own - but considerably cheaper