Neosporin is edible...that's not a problem.
You want a vet with chameleon experience. Typically, the term "exotics" is a clue. There's a reference list at the top of this forum.
You may need to call some vets to ask if they have chameleon experience.
The sooner you can get them separated, the better. They will cause each other stress just by being there (and don't let them fool you by hanging out together, they do that to mess with your brain!).
/\What Eliza said. Start looking for exotic vets, and find the one with the most chameleon experience.
The tail looks pretty bad

I cant tell, but it seems it was crushed, it could have been burned though. Its definitely heavily damaged.
Either way, there is a chance it could heal, or it might not. If it doesnt, the animal can still live a long healthy life
From the pictures, Im not 100% sure you have meru's.
It seems like a xanth in the picture.
Just an observation.
You may also want to fill out the "how to ask for help" form.
It goes over all aspects of your husbandry, its a great way to get experienced advice on how you are caring for your animal, and get a heads up on anything that needs changing.
Chameleon Info:
Your Chameleon - The species, sex, and age of your chameleon. How long has it been in your care?
Handling - How often do you handle your chameleon?
Feeding - What are you feeding your cham? What amount? What is the schedule? How are you gut-loading your feeders?
Supplements - What brand and type of calcium and vitamin products are you dusting your feeders with and what is the schedule?
Watering - What kind of watering technique do you use? How often and how long to you mist? Do you see your chameleon drinking?
Fecal Description - Briefly note colors and consistency from recent droppings. Has this chameleon ever been tested for parasites?
History - Any previous information about your cham that might be useful to others when trying to help you.
Cage Info:
Cage Type - Describe your cage (Glass, Screen, Combo?) What are the dimensions?
Lighting - What brand, model, and types of lighting are you using? What is your daily lighting schedule?
Temperature - What temp range have you created (cage floor to basking spot)? Lowest overnight temp? How do you measure these temps?
Humidity - What are your humidity levels? How are you creating and maintaining these levels? What do you use to measure humidity?
Plants - Are you using live plants? If so, what kind?
Placement - Where is your cage located? Is it near any fans, air vents, or high traffic areas? At what height is the top of the cage relative to your room floor?
Location - Where are you geographically located?
Current Problem - The current problem you are concerned about.
Pictures are helpful