I used to have hives, also on my legs mostly. It lasted for two-three months, then were gone. Now I am starting a long sober jorney again, hope that nasty thing won't appear.
Risktheblossom. I had some itching, though not severe. Ask your doctor to prescribe you some medicine to cope with it. If you feel embarrassed to tell that you are having this from withdrawls, just say that you've been nervous lately, or have some allergy. They will test your blood and find something that works exactly for you.
Have a good weekend.