Baby spitting up and grunting?

So I have a few questions..first, my daughter (about 4.5 months old) has been spitting up after *most* bottles. Sometimes a few minutes after, sometimes an hour or so after. I haven’t changed her formula so I’m not sure why this is happening. I do keep her upright for a while after.

Next question..she has been doing this weird grunting thing which kinda sounds like a noise she might make if she were constipated. However, she hasn’t had any issues pooping. I try peddling her legs thinking maybe it’s gas, but that doesn’t do anything. Not sure why she’s doing this either...

And my final question...she got this red spot near her butthole. It’s not raised or anything and when I touch it or while her, it doesn’t seem to bother her.

I know you guys aren’t doctors and can’t give a diagnosis, I think I’m going to call her doctors office, but I was just wondering if you might have dealt with any of these things or have any advice? TIA!