Bumps/hives in the tattoed/laser treated area (Photo)

I had my first laser removal treatment done 2 weeks ago on my full sleeve. 2 weeks later (yesterday) some bumps/hives showed up in the treated tattooed area closer to my wrist, and it does itch. I started taking an otc antihistamine (reactine), but I find it odd that the bumps are restricted to only being inside the tattooed area and not anywhere else around the body. Is this something that is consistent with a common allergy or should I view it as some serious skin condition developing?