Been stung all my life, over half century. Suddenly in 2017 I react violently to honey bee sting. By 2018, back to normal, bee stings are not noticeable in 30 minutes.
Then 2019, several stings and all is well in 30 minutes. Just last week stung on finger and no reaction.
Yesterday received honeybee sting on forearm and see the pic for yourself: