What are good ways to lose arm fat but not gain muscle?

Exercise: Exercising your arm muscle groups to tone them and reduct fat will increase muscle mass but you can moderate the exercise if your muscle mass gets too large.

There's no such : Thing as natural spot fat loss. You need to lose weight in general ; a certain % will be arm fat. Eat healthfully ; be physically active. Calories burned must > calories consumed. You can tone your arms w standing biceps curl w dumbbells, hammer curls w dumbbells, triceps kickback w dumbbells ; lying triceps extension w dumbbells.