Advice for mouth infection

[Boa Dave]

Looking for advice on a mouth infection my columbian boa has gotten.
Please let me make it clear I am not trying to avoid a vet visit. Vets in my area that will look at a reptile are very hard to find and with this whole COVID-19 thing going on, most are not taking appointments.

The infection is not severe. Yet. It appears to be only on one side, and near the outer edge. It has started to affect the alignment of her lips.

I think it may have started because I tried changing from newspaper bedding to pine shavings. Should have known better. She was fine for years on newspaper. So was every snake I ever owned.

I have now switched her to astro turf. She is active and I am letting her get exercise on sunny days. Of course her appetite has dwindled but she was such a healthy eater she is in no immediate danger there.

Should I try to swab her with peroxide or anything else while I wait on an open vet appointment?

Any advice is appreciated.
Thank you.