Red, bloody looking patch on tattoo after tattoo has been healed for 2 weeks?

I got a tattoo about a month and a half ago, it has healed perfectly except for one area that turned red when it should be blue. this started out looking like discoloration but now looks bloody and feels bumpy when touched. tattoo has been cared for as suggested by my artist and has not been treat irregularly to this date. any idea as to what this could be? if and when it will heal? and will it affect the outcome of the tat? thanks in advance :>