| I have itchy armpits from time to time. Usually, I end up scratching like crazy. Then I end up getting the kind of bumps that you have, I think this is because I have irritated my lymph nodes because of my scratching. Mine bumps have normally have gone away after a few days. The bumps have caused great concern for me, just like they have for you.
I would say make sure that the area is as clean as possible. I don't know if you have done this, but also, if you might have been using a different deodorant than usual, you might want to discontinue using it. I think that changing deodorants has been some of my problem. Another thing, is that if you shave your armpits, you might want to quit doing that for a little while. If you do shave your armpits, maybe you have been using a different razor or solution for lubrication for the shaving? I have also found that some types of new clothing can also cause irritation to my armpits in such a way that I will want to scratch them a lot. I quit wearing the clothing that was causing the irritation.
Just some thoughts based upon my experience...
If the bumps don't go away in a few days after trying the above, then it would be best to see a physician. | 
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