So, I have all of the packs bought for the game and even quite a few mods added in to enhance the game. I took notice that one of my Sims has a red blush on his face. At first, I assumed it was that he is sick, but there was nothing to indicate he truly was. I opened CAS to see if it was a blush I could easily remove with a simple click of a button, but nothing to come close to it. It surrounds his eyes, his nose, and his cheeks. I'm curious if I can even call it a sunburn or if it's a glitch I can fix somehow. Though, if it is a sunburn, I am curious about how he must have gotten it since I never got him to sunbathe, and shouldn't sunburns go away in only a few days?

Do you know which mods you're using and what each of them does? do you update them regularly?
you could make sure it's a mod issue/feature by simply removing all mods and checking your sim then..

what you're describing sounds similar to the blush effect of the Slice of Life mod
I never used this mod myself, but I think usually those effects are buff dependent
do you see any strange buffs on your sim?

Literally the same is happening to me. HELP

Someone said this

"Solution found! It was Nisa's WP mod, and its blush feature, you just gotta look for her Override Blushing File on her page and install it, fixed it right away!!"