weird rash-like patch with tiny bumps near underarm?

right before my underarm, i hate a rash thing. its like normal colored skin but there's little tiny bumps in like a 1-inch range. it's only red-ish cause it's itchy and i've been scratching it. :[
could it be from the deoderant i use? or could it be eczema or something, idk.
answers would be nice.
 
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