Lip cyst? Is this urgent?

I have a vet appointment, but we do have an emergency vet if necessary. Earliest vet visit in my town was Jan the 12th. If anyone could take a look at the attached pictures and tell me what they think. Im looking at the purplish black cyst, blister, rounded area. Its on the left side of his lower lip. He doesnt seem bothered by it, eating, drinking, and voiding normally. Any help is welcome. His name is Potato.

pics: https://imgur.com/a/OUJih1t

• Species: cat!
• Age: 11
• Sex/Neuter status: neutered
• Breed: american short hair
• Body weight:10lbs
• History: initial encounter
• Clinical signs:
• Duration: Around christmas
• Your general location: Texas
• Links to test results, vet reports, X-rays etc. :N/A