Do I have a chance at getting workers compensation?

I work at a retail store and I was unpacking scarves when I had a horrible allergic reaction and broke out in hives all over my body. I went through so many doctors visits to figure out what it was because the hives on my legs turned purple. I found out that it was hypersensitivity caused by hives from an allergic reaction. I was denied workers compensation and I just want to know if it is worth pursuing a lawyer and fighting it. They said that I was denied because i did not suffer a work related injury, but there is also a box beside the spot that says that the injury was not within the scope of employment. But, the hives appeared at work and I still work there so I'm not sure why.