I noticed two small itchy hives on my hand 4 days after my second pfizer covid vaccine. didnt have that after the first shot. do you think thats from the vaccine?

Maybe: Allergic reactions from the Pfizer COVID 19 vaccine (not anaphylaxis) included symptoms like rash, itchy skin, mild respiratory symptoms or scratchy throat. REF: https://www.medicalnewstoday.com/articles/covid-19-allergic-reactions-to-pfizer-vaccine-are-rare#Milder-allergic-reactions

Yes: Hives after a coronavirus immunization is very uncommon but definitely has been reported (several times). Now that its' been several days, I assume (hope) that the reaction is going away. Should have no long-term consequences but ... we all may need "booster" shots of a coronavirus vaccine to deal with emerging "variants". This could be an issue if/when they become available