I have really bad armpit fat on one arm. My other isn't bad. What can I do to help? (Photo)

For lipodystrophy in this area liposuction will be the best option.  Since one side is larger, more fat will need to removed on this side.

Physical exam needed, but it appears that you have redundant breast tissue in your armpit, and it is fairly common. Treatment involves direct excision with the scar hidden in your armpit. Be sure to consult with a board certified plastic surgeon. Good luck!