The same just happened to me I had blood work on May 13th and the first day it wasn't much,But by the next day the bruise on my armwas HUGE and different colors and it actually made my whole elbow ache. The lab tech did not do anything wrong she was very gentle. So It wasn't her being rough. I am just not sure why that happened and the bruise actually moved down my arm. It is getting close to be gone it has been 12 days.