50 years ago I got a rash on my elbow, and the doctor, apparently wanting the easy way out, said I might be allergic to any number of things, one of which was peanuts.
After a week, the rash went away and never returned.
My mother never thought about demanding that the school ban peanuts, chocolate, cheese and everything else the doctor suggested might be the problem.
LOL, so you have no idea what caused thwe reaction, in other words. They have tests for these kinds of things, you know. Science has come a long way since you were a tyke so long ago. If you want his test score on peanut allergy, I’ll go look it up for you when I get home tonight.
Oh, but I guess it could have just been a coincidence ... the very first time we ever try to feed him peanut butter, and he eats nothing else, and he immediately has a violent reaction that leaves him with an IV and covered with hives, gasping for breath.
It happens.
Nothing you can do about it.