Hi,
Welcome to the ehealthforum and I am glad to help you out.
Like all warts, oral warts are caused by the Human Papilloma Virus which invades broken skin. But they are not very common and can be spread very easily through kissing or oral to genital contact.
Mostly they are harmless and can go away on their own. Specific treatment includes surgical removal, freezing with liquid nitrogen (cryotherapy), chemical injections, or laser surgery.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.