I burned my baby 😒😒😒

My dumbass was trying to set a bag of freshly popped popcorn down next to him so I could pick him up and it tipped over. He was laying on his stomach and a kernel must have rolled under him....I've never heard his hurt cry before 😒. It's red and there's a bubble with yellow liquid about the size of a BB now. Should I call the pedi? He's 4 months.