I found this on Webmd.com
If it was my child, I would get a 3rd or even a 4th opinion…DR’s sometimes are ridiculous
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What causes sore a tongue and tongue bumps?
There are many things that can make your tongue sore or cause painful tongue bumps to form, including:
* Trauma. Accidentally biting your tongue or scalding it on something straight out of the oven can result in a sore tongue until the damage heals. Grinding or clenching the teeth can also irritate the sides of the tongue and cause it to become painful.
* Smoking . Smoking excessively can irritate your tongue and make it sore.
* Canker sores . Many people will develop these mouth ulcers on the tongue at some point in their life. The cause is unknown, although they can be worse during periods of heightened stress.
* Burning tongue syndrome . Some post-menopausal women develop this syndrome, which makes the tongue feel as if it has been burned.
* Enlarged papillae. If one or more of your taste buds becomes inflamed or irritated, it can swell and form a painful bump on your tongue.
* Certain medical conditions. Medical conditions, including diabetes and anemia, can have a sore tongue as a symptom.
* Oral cancer. Though most sore tongues are nothing to worry about, you should consult a doctor if you have a lump or sore on your tongue that doesn’t go away within a week or two. Many oral cancers don’t hurt in the early stages, so don’t assume a lack of pain means nothing is wrong.
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I hope this helps some. I have a four year old and I know how you might feel….