Why do i have a big cut on my upper lip and how do i get rid of it?

Let me explain : If you did not have that cut before and have no injury, most likely due to cold weather or dry skin conditions. Use a moisturizers or chap stick on it for a while if did not go away check it out.

Dry lips: If you do not know how you got a big cut then the lip is most likely cracked. There are many causes of cracked or dry lips such as smoking, vitamin deficiencies, allergic reactions or spicy foods could also cause the problem. Treatment is to use an unflavored lip balm, petroleum jelly, aloe vera or vitamin e ointment. If it does not clear-up then call you doctor or dentist.