In the past few weeks, I have had lip swelling for no reason. I have not changed makeup, Detergent, foods, perfume, bath soap. I have never been allergic to anything. There is no sore, broken skin. It just happens at any time for no reason. I could be talking and all of a sudden a corner of my lip begins to swe ll up. It look like I bumped it or someone hit me. I have never had a cold sore either. Do not have herpes simplex. This is weird and scary.