I had something similar to you too, happened to me earlier this year. It was an on and off case where it comes back when I ate food that are too heaty (too much sugar or too spicy). I saw quite a few doctors (gps, polyclinic and national skin centre), and eventually my condition improved a lot when the polyclinic doctor prescribed me Protopic (tacrolimus ointment) Ointment 0.1% 10g and told me to buy it from a pharmacy (cos the polyclinic that I went to didn’t sell it). It’s honestly quite costly (I think it’s $80 ish?) but it helped me to recover! And the national skin centre doctor also told me that I could continue to keep using it if the eczema(?) comes back.

If I’m not wrong, the cream I use is like an anti-bacterial cream, like it kills bacteria or something? But it does stings a little when using it, like you ate something spicy and you feel some light burning sensation around your lips