Eczema? I have eczema but this is new I’ve never had this under my arm

had this under my arm for 2-4 months now i dint remember exactly when but i know its been there for awhile under both armpits and it seems it started happening once i started using a new deoderant ? it wont go away

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Eczema seems a lot worse in the winter. I used Tea Tree Oil. It is amazing.