One of the things that caused me to sweat excessively in that area was having taken too many decongestants (Including a once daily Allegra-D, and other over the counter meds). I have been a regular user of Allegra (Non-decongestant) for the past couple of years, and I really don't have the problem anymore. I generally don't sweat much anyways, but I noticed that one problem and my pediatrician who I've known for almost three decades told me that the decongestants can cause it, or at least exacerbate it. Btw, for those wanting a treatment, they have prescriptions for it and they used to have a great one that discontinued which was made in Glades, Florida, but currently you can buy it over the counter in roll-on and stick form (It's called: Certain Dri, and the roll-on is best for night, the stick for daytime). Even if you don't think that you sweat excessively, it's awesome to use if you're going to be in a nervous situation, or wearing formal/dressy clothes on a hot day.