It could be anything causing these pimples to form. Intolerance could come from a combination of++
My routine is pretty simple, IMO>>
I would start with peels (MUAC) and consider a small amount lip filler like Restylane Kysse
No actives, just lots of ceramides & other humectants to keep dry skin at bay after tret.
In my current routine Sente Dermal Repair Ultra Nourish is most expensive but in past before +
maybe try a 2.5% BP wash or leave on. Personally I cannot use higher than that but r/o