go by how your body feels.  but dont stop training it. i dont mean hard, but maybe high reps and light weight to  pump some blood in it.
do you stretch???  stretching khas help me stay injury free while doing have weights.  I would suggest, icing it..
by reading that your not hurting. it  kinda makes me think that it maybe just a broken blood vasol.   but see if it clears up. and returns to you natural skin color. but if not, and its killing you tomorrow then you should see  a Dr.