Why does my under arm get really red and dry?

Hey18

New member
About a year ago under my arms became really red and sore. In like two weeks it cleared up then about a week ago. It happened to me again only it wasn't as bad recently I have been thinking, it may be because of my deodorant. So I looked it up and people were saying deodorant with aluminium is really bad for your skin.
But I looked on the back of my deodorant and it does not list aluminium. As being inside it does anyone know why this happens to me?
 
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