allergic to my fiancé’s cum?!

This may sound really weird but I’m worried I have a semen allergy I’ve never had any issue with unprotected sex that me and my fiancé used to have I’ve never had an issue with swallowing his cum either but whenever it gets on my skin I get very itchy and red in the places where he came like this morning he came on my chest i’ve had the same thing when he came on my face i get itchiness red and blotchy We both been tested for STDs

And STIs we are clean I don’t know what is causing this and I looked it up and it can be an allergic reaction to the proteins in mens semen 😭 have any of you guys experienced this?