Ok, so long story: I purchased a ball python from a pet store. Within a week, it had bubbles around it's mouth. Pet store bought it back from me and took it to the vet. Told me it was a fungal infection, and that it had 18 days of treatment. Here we are, nearly a month later they tell me the snake has a "clean bill of health," I bring the snake back home, and notice there's still bubbles, the same amount and consistency. It's not something they could have missed, because there is liquid smeared on the sides of the box they gave me the snake back in. What do?