Woohoo. Great news. Very glad you had it checked out.
Ugh kids could be very mean. I know I could have been when I was younger also and regret it immensely. Maybe just telling them before class. Hello my name is....... And I am an oral cancer survivor!!!! How about that for some inpowerment. I know that if my teacher told me that when I was younger I would talk to my friends about it. Which would spread the word.
I know it's hard but don't be embarrassed by what you have gone through be proud!!!!