Beginning two days ago, I had a sore throat. For the last two days, I have had itching and swelling of the inner cheeks, gums and lips during and after eating. I can feel striations on the inside of my cheeks, though I have not had any trauma to the area. My throat currently mildly sore. I m probably a little dehydrated (dark urine), though I m not especially thirsty. What might this be?