My armpits itch a lot! It gets worse in heat, but I tend to itch all over when it's really got outside. I keep my armpits shaved and clean. I tried changing deodorant (from Dove to Lady Speed Stick) and that helped a little but they still itch when it's hot.
I recently had a mole and skin tag removed from one armpit and two skin tags from the other. I thought maybe they were what was causing the itching but after having them removed and healed, I still itch.