Rashes due to what reason

Does anyone know what this is and how to treat? Not sure rashes due to recent heat or food or just general dust #pleasehelp

Rashes due to what reason
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It is milk rash. My second born now, 4 months old still having this. I will usually wipe with lukewarm water and clothes, put moisturiser and after every milk session be it FM/BM,I will wipe it too.