I have a bad armpit irritation.?!

I have a bad armpit irritation.?

This is quite embarassing but I've developed a really bad irritation under one of my armpits. The skin is very sore and red and it stings quite badly. I also shower daily.

Does anyone have any ideas on what it is and what can be done about it?

It cant be my deodrant as my other arm is fine. Its just my right one.

Thanks

It could be any number of things, it could be a reaction to ingredients in deodorant, so maybe try using alcohol and aluminium free deodorant, see if this makes a difference. It could be a heat rash, in which case clean the area with a mild soap, dry carefully, then put some cream such as sudocrem on the area, (sudocrem is used for nappyrash) preferably overnight, be careful of your bedsheets!! Then the next morning wash and dry carefully again and apply the least amount of deodorant possible so you feel comfortable. This may need to be repeated a couple of nights. Hope it gets better.