Hi, Do You Know What Can Cause Swollen Lips? It

Hi, do you know what can cause swollen lips? It comes and goes, sometimes for weeks and then disappears. They are not noticeable to others but the corners feel chalky and sometimes split too. I know it is sometimes caused from adrenal fatigue. But I am wondering if it can be caused by anything else such as a virus or bacterial infection.
Thank you. Norm