do you rotate? I know it is hard without a lot of fat. i lost a lot of weight this summer and it hurt to inject in my belly area. but try to rotate all day long: . front upper thigh, back thigh, buttocks, below buttocks and belly. i never could get use to the arm. rotation of injection site is pretty important to avoid those complications. it must really hurt to keep injecting into the bruises and not have time to heal. also, maybe a shorter thinner needle.