Your boa most likely had a cut from snout rubbing that got infected and is now filled with puss. I had a boa get that a long time ago. I took it to the vet and had shots of batryl given to it every 5-7 days I think it was over the course of about 6 weeks. It healed after a couple sheds and was gone for good.

Take it to a vet to be sure! The above written can easily be wrong. If somebody sold you that snake, they sold you a injured snake!

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