On both leg I have what could be the Petechiae; blood vessel bursting in swollen up; My hematocrit ATT was elevated 49.8/have slightly too much red blood cell in my; the capillary are bursting; This is a spontaneous report from a contactable other HCP (Registered Nurse). A 77-years-old patient of an unspecified gender received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, Batch/Lot number was not reported), as 1st dose, single dose for covid-19 immunisation. The patient's medical history and concomitant medications were not reported. The registered nurse stated, received the Pfizer Vaccine on 11Mar2021 that was the first dose, and second dose was on 01Apr2021. The patient noticed after the first dose not right after the couple days that which the patient never has before on both leg the patient has what could be the Petechiae the patient did have blood work done and the patient's hematocrit ATT was elevated 49.8 and the patient do understand the patient was a nurse and the patient understand when your hematocrit was elevated the capillary which joins veins to the artery can burst but the patient believe they didn't and the patient don't see anywhere on body. The patient did never have it previously except after getting the Pfizer first shot and the patient saw the family doctor and he said that he would take care, but he just dropped it, but the patient concerned about the situation. The patient thought think it should be reported because the patient's hematocrit was never been that high and patient never had blood vessel bursting in swollen up Petechiae you know what they are got u like a rash you know what Petechiae is. First dose was confirmed as 11Mar2021 and second dose was confirmed as 01Apr2021. The nurse stated, "the events started on 11Mar2021, but the patient hardly think that It was scheduled so didn't knew really but then the patient only goes for grocery shopping every three weeks so, the patient was in town for about 4 hours. The patient short of noticed I had my first shot on 11Mar. The patient think it was from 11Mar2021 and 12Mar2021 it was there on my leg, but the patient was just thought that what was this and the patient like, but it was still there. If I lift something heavy it becomes more prominent. First thing in the morning after lying down it was prominent. So that was telling me that this cause because the patient also have slightly too much red blood cell in my what patient do the blood work and that tells me, that it had been since the patient never had the Petechiae before and it also tells me that after sleeping for eight hours it's less prominent in the morning until the patient start getting on feet or something in the home or you lifting a little it was more prominent the petechiae, so it leads to therefore the capillary are bursting and never did before I have this vaccine. The patient told doctor and he didn't tell me to take anything for it, but the patient really thought should see a cardiovascular surgeon because ever since it was happening it was the under, patient thought about kind of doctor, patient should see but he does not refer me to any doctor but myself don't want to have this problem I mean, patient have been pretty healthy. The patient first thought of dermatologist but then patient thought it over and thought of cardiovascular surgeon that deals with the blood vessel. The patient did not received the treatment for the events. The outcome of the events was unknown.  Information about lot/batch number has been requested.