WARNING: little graphic for some people. Small, Painful, White Bump on His Gums.?

So my husband noticed a red bump about the size of a poppy seed on his gums about 3 days ago. Now it's slightly bigger and has now become extremely painful, hard and white. Also, there is an indent the size of his pinky tip above it in his gums. (Sorry about the pic quality. I cropped it to zoom way in) Does... show more So my husband noticed a red bump about the size of a poppy seed on his gums about 3 days ago. Now it's slightly bigger and has now become extremely painful, hard and white. Also, there is an indent the size of his pinky tip above it in his gums.
(Sorry about the pic quality. I cropped it to zoom way in)

Does anyone know what it could be?
Thought 3 days ago that it might be an abscess, but it isn't like any abscess he's ever had before.
**Please be respectful. Serious answers only. Thanks ☺️
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