Is it safe to get a tattoo on the arm if i've had cellulitus in the groin twice. i have 2 tattoos before with no problems. the place is very sterile?

Tattoos and safety: Yes. If the cellulitis has cleared and your skin has no other sores or lesions and the tattoo place is sterile or clean there should be no problem.

Safe, but: Tattoos likely safe from the standpoint of cellulitis, but you can be at risk for getting hepatitis or worse depending on the sterility of the parlor's equipment and your own hygeine.