How can i reducecmy fatty arm? the rest of my boy is fine n my bmi is normal

Arm fat: Best bet is to do some progressive tricep/bicep toning with light weight.

Arm: You can tone your arms with simple exercises you can do anywhere with small weights/soup cans or...Seated with back against chair elbows @ side hold wt firmly and bring wt up whole not moving elbows away from body, move arms to 45 dgrs; repeat not moving elbows frm body, move arms to side of head hld firmly against head plms face head; move wt strt up rotate plms 90 dgrs ; repeat. 3sets of 10 4 ea.