Hi Dr Herrick, I Had Blood Taken Just Over A

Hi Dr Herrick,
I had blood taken just over a month ago which has left me with a bruise that is in a perfectly straight line under my right index finger. Also at the same time this appeared, approx half way up my bicep in the exact same straight line was a line around 1 inch in length which looked like dried blood under the skin (this has now gone). I am sure it is nothing serious however I am starting to get a little concerned because it is coming up to 5 weeks ago when it first appeared and new nail growth doesn't look any better. Thanks, Lee.