This is a super old post but in case the ? comes up again-if it isn’t the same area then you’re in the clear. Just had a really large piece done on my back, right side back shoulder blade on Monday. Went in Tuesday, not even 24 hours later & got an even larger piece same spot but opposite side, which was also a cover up, have had no issues so far a week later. No need to space the work out unless it’s on the same tattoo or directly in that area. So no worries to anyone else who comes along with the same question.