Hey girls! My son has some redness on his cheek, it's been happening f…

Hey girls! My son has some redness on his cheek, it's been happening for a while, sometimes it would go away then. Now it's getting more pronounced, I thought it was from eating cake. Although I always eat everything, nothing like that happened before. I'm not eating anything sugary or potentially allergenic now, maybe this is a reaction? Or from the powder? We have a fluffy babysitter since birth, and we haven't had such redness... pediatricians didn't see it much when they saw him, now I think I should take him again, but I wanted to ask you first ?