Super weird, but I think the Cosrx snail mucin essence is breaking me out? Does anyone have any idea why?

My skin is neither acne-prone nor sensitive, but last month, I got a few pimples, one time, I even got two pimples the same day. I know that doesn't sound like a lot to most people, but it's very unusual for me. The only new additions to my routine were the snail mucin and a new sunscreen. Initially I thought it was the sunscreen, so I stopped using that for a few days and I couldn't observe any change. Then I stopped using the snail mucin for a few days and my skin went back to normal. To be fair, the breakouts weren't dramatic or anything, but like I said, it's not something I'm used to so I got all suspicious immediately. Does anyone have any idea what ingredient in the essence could have prompted this?