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Raised bumps in tattoos

Hey guys, just looking for a little feedback here. I tattooed a client about a month ago, black tribal cuff around his wrist. The tattoo has healed obviously, but on the outside of his wrist he has developed 3 small bumps, all in one small solid black area of the tattoo. He has a lot of black and grey work as well as colour so I am pretty sure it isn't an allergy. Does anyone have any advice? I was thinking perhaps keloid scarring due to the fact that he works on a computer and this could have affected the healing?

Any comments would be welcome.

Many Thanks