Yah it looks like when we as adults bite our cheek and get sores, but is he's teething he probably is chewing down on that side

It must be that!! I think I will take him to the doctor tomorrow! He is been teething

Gumming not gunning, stupid autocorrect

I was just reading that in babies teething can cause them. They catch their cheeks while they're gunning at things and basically bruise them and the blood blister forms...so maybe that? If he seems uncomfortable it might be worth a trip to the doctor to be safe.

@mrssarahbeth, do you know how it can go away ?

He is 4 moths ) only drinking formula!! @mrssarahbeth

It looks like a blood blister. Those have that bright red color but don't bleed unless they pop. They're similar to canker sores, has baby tried any new food or chewed on anything that might have caused an allergic reaction? Food allergies tend to be the common cause for these (if that's what this is, I'm not a doctor I've just had them myself before).

@junesmommy_15, never seen something like this before !!

Is not a cut ! Looks more like a pimple / grain!! And it's not bleeding!!

Does he suck his fingers? If so, is his nails clipped?

Is that a cut?