My lower left lips keeps numbing, scarring and splitting everytime i have a cold, i dont have cold anymore, my lips still are healing. but why is my lips affected and keep on getting wounded on the lower left side?

If not herpes, then: Persistent dry lips may be lip eczema, which can be treated like skin eczema, using a few days of hydrocortisone plus weeks of Aquaphor to retain moisture. Sometimes, lipsticks or lip sunscreen chemicals cause an allergic reaction on the lips. Other times, a person is a primary lip-licker (it's his habit). If dry lips crack, they get irritated by foods or juices. Dr.'s exam can sort things out.