My DS is 6, molars coming through. Has been complaining about mouth pain for a couple of days, but was pointing to the gap where a lower milk tooth fell out recently. He is autistic and can get a bit muddled with descriptions, but tonight he was a bit more clear and said it was at back of mouth. I had a look and saw what looks to me like a huge mouth ulcer on inside cheek. It’s yellow/white and really sore, and wondered if anyone who is familiar with ulcers would mind looking and confirming if they think it is/isn’t an ulcer? Am not sure if I should take him to GP or just use bonjela/saltwater rinse and see if it starts healing. Thanks a lot