Denise:
Many people with dry
armpitArmpit lump rashes don't have a problem with antiperspirants so much as a mild form of eczema
commonCommon cold in that region, which antiperspirants just aggravate a bit. Try OTC hydrocortisone (1%)
twiceTwice-a-day a day, and see if that doesn't make it go away. If it does, you can resume it once in a while as needed. If it doesn't help, ask a doctor to prescribe a somhwat stronger cortisone preparation.
Best.
Dr. R