Looks like my lotion has citric acid, after reading more I'm pretty sure my face wash or lotion did it.

I think it must've been that. I used cetaphil face wash and lotion before and after, the lotion has citric acid which might have done it?

So I used the super serum for the second time today, and it stung a little bit when I put it on but that's not to unusual. But then my skin kept feeling warmer and warmer and turned bright red. I washed my face and 30 minutes later it's mostly back to normal. Is that a normal reaction to it? Or am I...