Oral mucosa heals faster than skin,[2] suggesting that saliva may have properties that aid wound healing. Saliva contains cell-derived tissue factor, and many compounds that are antibacterial or promote healing. Salivary tissue factor, associated with microvesicles shed from cells in the mouth, promotes wound healing through the extrinsic blood coagulation cascade.[3][4][5] The enzymes lysozyme and peroxidase,[6] defensins,[7] cystatins and an antibody, IgA,[8] are all antibacterial. Thrombospondin and some other components are antiviral.[9][10] A protease inhibitor, secretory leukocyte protease inhibitor, is present in saliva and is both antibacterial and antiviral, and a promoter of wound healing.[11][12] nitrates that are naturally found in saliva break down into nitric oxide on contact with skin, which will inhibit bacterial growth.[13] Saliva contains growth factors[14] such as epidermal growth factor,[15] VEGF,[16] TGF-β1,[17] leptin,[18][19] IGF-I,[20][21] lysophosphatidic acid,[22][23] hyaluronan[24] and NGF,[25][26][27] which all promote healing, although levels of EGF and NGF in humans are much lower than those in rats. In humans, histatins may play a larger role.[28][29] As well as being growth factors, IGF-I and TGF-α induce antimicrobial peptides.[30] Saliva also contains an analgesic, opiorphin.[31] Licking will also tend to debride the wound and remove gross contamination from the affected area https://en.wikipedia.org/wiki/Wound_licking.

Salt is also antibactarial. I tried putting salt water on my lips but that but only made the crusts form really fast. I think the lips should also be kept moist.
I thought ec is caused by trauma of the skin cells (Daniel Miller explained this) , am I wrong?

Give it up, man.

Since you have this condition, you should be trying to help instead of lead others to "cures" that cause EC. Why is it funny to give the wrong advice. I'm not referring to the cover up posts with some other natural treatments we all know about.