Why I always have problem with my mouth ?

Ok....kanker sore has been away from me quite awhile, I'm happy with that. But why am I getting this long run allergy on my lips ? You think I have been swearing too much ? Or I have been eating too many McDonalds ?
Don't get me wrong, I don't have problems with McDonald. The one that closes to our office is a good place for lunch gathering with my colleagues/freinds. I really enjoy the time over there with them. I know I'm going to miss them all after I get transferred back to the other nightmare department.

Anyone could tell me what kind of allergy it could be as it last for more than a month already. I couldn't let my lips crazy like this forever.
I know....my friends have been saying something good to me all the time and said it would be cured just to comfort me. But I really couldn't stand the chapping and peeling whenever I eat or drink (either hot or cold) or when I get up in the morning and look at the mirror. This is painful !!!!