Check in with your veterinarian to find out the cause and the cure.
Carmex
Sores on the lips and mouth are most commonly caused by the herpes simplex virus (cold sores) or canker sores. Cold sores are contagious and typically appear as small fluid-filled blisters around the lips, while canker sores are not contagious and appear as painful ulcers inside the mouth. Both usually heal on their own within a week or two.
The major symptom of cold sores is feeling some unusual sensations around the lips.
you get cracked lips from cold exposure and not enough moisture on your lips.
No
Medications will help by reducing the intensity and frequency of cold sores. There is no guarantee of any known medication today, that will prevent cold sores.
You can take the chance if you like, but to be safe, don't do it. The virus that causes cold sores is very contagious when the sores are in evidence and for a period before they show. Best bet is to be cautious and don't chance spreading this painful affliction any more than you have to.
Cheilitis is inflammation of the lips which can result in dryness, cracking, and sometimes sores or swelling. The lips are the part of the body affected by cheilitis.
Well if you don't keep dry lips moist they can crack and end up bleeding getting cracks in your lips i would fine a good chap stick to use your lips might end up having sores on them become hard to heal keep them moisturized the best you can do is use abreva to heal the sores and blisters.
Cold sores can be located on the lips, facial area, and genital area.
See the related link for information and pictures of cold sores.
There are several types of mouth sores that can occur, including canker sores, cold sores, and oral thrush. Canker sores are small ulcers that appear inside the mouth, cold sores are caused by the herpes virus and appear on the lips, and oral thrush is a fungal infection that can develop on the tongue and inside the cheeks.