If it looks the same as the break outs before, and moogoo is helping, it could still be eczema. DD is having a significant skin crease flare up ATM due to the heat / humidity. It has also extended a bit beyond this to her legs and arms.

But if you want to be sure about the allergies / intolerances a referral for allergy testing is needed. I would also consider a dermatologist review too to assess the skin appropriately rather than a GP.