How can I heal this thing without poisoning myself?

I have this thing on the corner of my mouth. It started as just a little irritation, but then I kept picking the scab and making it bleed and it’s gotten worse. It seems to “tighten” when I don’t open my mouth much, but when I open it wide (to eat or to yawn, etc.) it cracks the seal on it and it hurts a lot.

I’ve had this for a couple weeks now and it’s really annoying. What is it and what can be done? I’d like to put this skin irritation stuff on it but everything says to avoid ingestion.

I’ve never gotten cold sores or anything. Any ideas of what it could be or non-poisonous healing creams?

Thanks!