This morning i woke up with painful biceps. There is a red line extending from where my nurse drew blood 2 days before and runs along my biceps into my armpit. Its painful to touch and hurts when i flex my biceps. At first there was no red line just pain but the red line gradually appeared and increased in intensity throughout the day.
Post injection from the area where the injection was given when the pain starts it will Be related to the injection given to you.  I suggest to use cold pack on your painful area.  And if its increasing even after that need to examine properly with some blood test and physical test.  So do visit your doctor for proper evaluation as well as treatment.  Here in writing It's difficult to check and evaluate.  Take care