What purpose does that little knob of skin on the upper mouth behind the front teeth serve?

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What purpose does that little knob of skin on the upper mouth behind the front teeth serve?

In: Biology
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No one else has that knob thing. Cancer?

It closes off the sinus cavity when you swallow food.

There’s another flap further down that closes off the lung entrance too, so that the system is fully sealed while you’re swallowing – wouldn’t want food or liquid to enter the breathing system.

My best guess at this is that it’s just a lump of skin pushed together. Maybe when teeth grow i. it just pushes the skin out of the way and since it’s neither beneficial nor harmful to your body it just stayed there

I think you’re talking about the incisive papilla. From what I know it’s just a bundle of nerves and is rich in blood vessels as it is situated lower to the incisive foramen where these nerves come through. If it’s a bigger or hurts then it’s likely inflamed, which is quite common. Usually you don’t really feel it.