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Based on your description, you likely have a blocked salivary gland on your tongue. This is quite common and can cause the appearance, swelling and symptoms you've described. Treatment by your dentist may be as simple as a massaging technique. It may also require a simple, quick procedure performed with a local anesthetic such as Novacaine.
If you can send a picture it would be helpful to more accurately tell you about your issue.
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You're most welcome.