hives all over legs and onto back (pictures)

Rose
this morning I noticed what looked like 1,000 mosquito bites lining my leg from my knee to the middle of my back, butt included. I went to the doctor right away and by the time I got there the bumps were barely there. he said it was just unspecified hives caused by something I'm allergic too (we don't know what) and to not worry about it. they just showed up again and I was wondering if any of this has ever happened to any of you?? please help this is so gross