18M Inflamed gum under 2nd molar

Recently, I noticed that my gum below my left lower molars is turning red. It hurts when my finger presses against it from the bottom or behind. It doesn’t hurt much. I use an electric toothbrush twice daily and floss once a week before going to bed. My wisdom teeth are still in place and I have never had a tooth infection.

I am 18M and do not smoke or drink.

Could this be an infected tooth? Could it be an infection?

Image: https://ibb.co/k6n6zLH

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