Omg something I can answer.
So the short answer is it DOES scab.
But the clot, since it’s wet always, doesn’t have an outer layer because it washes off. Imagine if you get a paper cut and then hold it under running water for 3 hours. It still clots, but the clot is internal only — you wouldn’t be able to see it.
As a side note your mouth also scars, but the tissue generates WAY faster than your skin so it isn’t as noticeable — something like 1/8th the amount of a skin scar.
I’m a dentist.
Edit: you CAN see a clot if it’s big enough — like when you get a tooth pulled.
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