Teething rash?

Jenna • Boy 💙 2/21/17, 🌈 Baby 6/1/18 Girl 💜 Due 7/31/19

Is this teething rash? Is there anything I can put on it or how long til it goes away. He sleeps on his side or belly so I think he lays in drool and been using his pacifier alot more since teething has been bothering him.