<s>[INST] hi i just gave myself a b12 injection in the top of my thigh( have been doin the injection for almost a year) about an hour ago. i just started cleaning and noticed my injection site is burning and it is pink under the point of injection ... what do i need to do? [/INST] Hi Dear, Welcome to Chat Doctor. Understanding your concern. As per your query you have stinging and redness at the site of injection of vitamin B12 at top of thigh which is because of localized tissue damage to the area because of needle entrance. Need not worry. It is not a nerve damage rather localized damage due to intramuscular injection. I would suggest you to visit physician once and get the area of damage examined. You should apply to Apply thrombophob gel and ice pack on the site of swelling. Apply numbing gel on local area as well. It will take 2-3 weeks to heal it properly. Hope your concern has been resolved. Get Well Soon. Best Wishes, </s>