Bleeding After Covid Vaccine Injection. Some experiencing heavy menstrual bleeding (menorrhagia), some bleeding before their periods were due or bleeding frequently (metrorrhagia/polymenorrhea), whereas some are complaining of postmenopausal bleeding. A sharp needle going in to your flesh will cause bleeding depending on the person giving the injection and the person injected, it will bleed for a bit, hence cotton ball.
• where possible, a smaller needle is used to give the vaccine, such as a 23 or 25 gauge needle. The effects may be coincidental. However, the data doesn't mean vaccines are necessarily linked.