Sudden sharp pain in right mid of index finger for a few mins.sore, stiff, mid sec of finger looks purple.brought in some bags.bp norm.blood vessle?why

See your PCP for ---: Being evaluated properly. It sounds like a bruise affecting the finger from bringing bags. See how it behaves in the next few days to a week. If it improves, then good; otherwise you might need to see a rheumatologist, if symptoms persist or are getting worse.

Sure it can be: Something as simple as a broken blood vessel or it could be a small cyst that broke or you simply may have bruised or contused your finger or pinch the skin and not realized it have a small puncture wounds even though there may not be an obvious entry wound and even a small sliver of foreign body . I can't tell you exactly is a reason why but those are some possibilities.