Are the painful sores in my mouth due to periodontitis, or are they canker sores?

Hi doctor,

I have multiple painful sores in my mouth that appeared two days ago. One being large, what I think to be a canker sore (kind of grey flesh with a bunch of swollen gum below it), one small sore (that is just two little dots in my mouth), and the other I have not looked at. I have had poor oral hygiene for the past months. I am just wondering if it is most likely gum disease like periodontitis or what it could be?

Hello doctor,

Thank you. There are two sores. One is the bigger one (it looks like a cut almost on my gums), and the other is some small white dots. There is another sore that is smaller than both of these on my upper left molar, but I cannot get an image of it. Pain is there around for two days. And the color may be more white than grey. It is hard for me to tell. Although they are very painful and it is hard to eat. If something touches the big one, it causes really bad pain, and if something touches the small white dot ones, it hurts but is bearable. I have attached the pictures for your reference. Kindly give your opinion.