Thanks for posting your query at DoctorSpring.com. I can understand your concern.
You seem to have developed reaction to the tatoo dye.
I would recommend that you apply mometasone cream over it twice a day for ten days.
You will need a prescription for it.
Also I would recommend that you take an anti histamine like loratidine that would help to resolve the itching.
Hope this helps, please feel free to discuss further.