What is the patient suffering from?

M: If you’ll just have a seat, Ms Thomas, I’ll look into your mouth. Open wide! Em, still a bit red and swollen. Have you been taking the tablets I prescribed and cut down on the cigarettes?
W: Yes, doctor. It’s actually not half as sore as it was.
M: Era, yes. Your voice sounds better as well. Just take the tablets for a few more days and we’ll have another look then.