Anti-antiperspirants control the amount of sweat. Deodorants mask the odor from the sweat. Some products do both.
by working out & sweating and not putting on deodorant
You can wash frequently, trim or shave the hair there and even buy fist-sized crystals of salt (sodium chloride) to rub your armpits with after washing. Deodourants and anti-perspirants can cause cysts and inflamed lymph glands in your armpits.
a lot, dogs dont sweat. get thee to a veterinarian.
Sure.
puberty
puberty Bacteria
Yes
It's grows by itself ?
yes - lymphatic
Depending on the connotation, the word armpits has various meanings. Obviously, it is the hollow place under the arm at the shoulder. In other usage, armpits can be referring to an extremely unpleasant place.
Tickle him under the chin or in the armpits.
Deodorant just gets rid of any bad smells, but antiperspirant will stop you from sweating. Check to see if yours is antiperspirant or just plain deodorant. Also, be sure to wash your armpits thoroughly in the shower! Good luck!