[color of my heart]

so i found out that i'm vitamin B deficient (awesome). and i have to have weekly B12 shots. however, the first one gave me a bruise that's probably 2 inches in diameter. i never bruise like this with shots. ever. like, the only time i bruised like this is when i got a heparin shot when i was sixteen.

has anyone else had to have B12 shots and gotten bruised? or is it something i should be worried about?