Hives after laser tattoo treatment?

I had a tattoo removal session with a q switched laser 6 weeks ago. 5 weeks ago I developed hives/swelling in lips and eyes lids and was put on steriods for 3 weeks. Now I am only on antihistamines 2 times a day bit I still have hives that cone and go on my tattooed wrist, other arm and sometimes torso. My skin has been itchy as well for the past two weeks. Will this every go away? How much longer will this go on for? My GP doesn't seem to know anything about why I am experiencing this.

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