This is a spontaneous report received from a contactable reporter(s) (Other HCP). A female patient received bnt162b2 (BNT162B2) (Batch/Lot number: unknown) as dose 2, single for Covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: Covid-19 vaccine (Unknown manufacturer), for COVID-19 immunization. The following information was reported: RASH (non-serious), outcome "unknown", described as "She broke out in a terrible rash from her waist to". Additional information: Consumer stated, "Well, I have a question. I have been doing my own little bit of research and I have been following a doctor who is from "PRIVATE", Dr. was very knowledgeable and he does a lot of research, he did the Pfizer's research about the Covid-19 virus and the vaccinations and I have a question because I was a nurse many years ago and I am retired now. But, I just want to know why in the "PRIVATE" for the majority of healthcare providers when they give the Pfizer Covid-19 vaccination, why do they not say any instructions to aspirate before injecting into the deltoid muscle? I want to know that, because people have had reactions to the vaccination (further clarifications unknown) and I think part of it is, I think it is pretty rare to hit a vessel in your deltoid muscle but it is possible and when I was in withheld, we were always taught before you give an intermuscular injection that you always aspirate first. That was the gold standard and I just want to know there is no, I don't think there is any negative reason for aspirating, it would not affect the vaccination at all because the person would still get the same amount of medication. You are not going to put air in because you are going to be clearing that needle before you stick the person anyway. I just want to know why Pfizer just to prevent even a rare instance of a person getting that right in to their vein or their artery, that they wouldn't just say aspirate before injection. That would be so simple because some countries do aspirate but for the majority, I don't think the "PRIVATE" does, I don't think the "PRIVATE" does and so I have had both my vaccinations and my booster all being Pfizer and I never even questioned when my healthcare provider was giving the vaccination because I assumed that they were aspirating. I didn't really pay any attention, because that would have been what I would have been doing, if I have had been the nurse doing it. So, that's my question cause I think it is very important because even if it's very rare that they would hit a vessel and inject that vaccinations if even part of it, into a vessel which could cause some serious side effects including myocarditis and pericarditis which has happened to people (Further clarifications unknown.) then why don't they just in the instructions of giving it? Why, even if the CDC says they don't have to aspirate it. 'Believe me' it is your company, it is your company's reputation that is on the line and you develop the vaccination. Why would they not just put in the instructions, must aspirate before injection?" Consumer was informed about the role of the Pfizer Drug Safety and to contact Medical Information Department for the concern and was informed that the department is open from Monday to Friday from 8 am to 9 pm, as per EST. When offered to share the contact number of UNKNOWN, consumer stated, "Yes, the more I look at this, it makes perfect sense. I just assumed when I got my vaccination, that they aspirated. So, tomorrow I am going to call my clinic and ask them, when you give the vaccination, do you aspirate? And if they say no, I am going to ask their rationale behind that. Because if they are just going by what CDC says that may not be right. I think when I go in to, the next time I go in to get any kind of vaccination I am going to say would you please aspirate but most people would not even ask that and I would not even have thought that they were not doing it until I saw some evidence from this Dr. in the "PRIVATE" about this and I thought well I am just going to ask my clinic, did you aspirate before you gave the injection? Because I did not have an adverse effect to, side effect to it. It was, I mean I had a little bit of, you know, I didn't feel good for couple days and something like that but it was not anything you know major, but I did have my second cousin who lives up withheld, when she got her second vaccination, she broke out in a terrible rash from her waist to." (incomplete sentence) (Further details not clarified hence split not made). The lot/batch number is not available despite the follow-up attempts made. Follow-up attempts completed. No further information is expected.