Sore white thing behind tooth?

Hi I’m just curious would anyone know what this is behind my tooth? I brush every day mouth wash also, but this pain white thingy has developed past 3 days and it’s so painful pain is going to my jaw also. I rinsed my mouth which didn’t help I used bonjela which doesn’t help also took paracetamol which also didn’t... show more Hi I’m just curious would anyone know what this is behind my tooth? I brush every day mouth wash also, but this pain white thingy has developed past 3 days and it’s so painful pain is going to my jaw also. I rinsed my mouth which didn’t help I used bonjela which doesn’t help also took paracetamol which also didn’t help. I’m in so much pain. I don’t smoke (also I know the colour of my teeth behind) it has gone down since yesterday but I’m still in a lot of pain.
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