A physician friend of mine completed the second do

A physician friend of mine completed the second dose of the MRNA vaccine last week. He is around 60 yrs. old. He sustained a reaction that included dizziness and skin blotches. In about 4 hours the side effects were gone. He did not describe it as an allergic reaction. Perhaps what has been perceived as a relatively minor reaction for a younger person will be experienced as something much more severe by someone 20 yrs. older, especially if there are comorbidities. Just a thought.