My top lip is swelling up for no apparent reason sometimes the swelling goes into my face and top lip but it is mostly found in my top lip. I feel itching and tightness in my lip the swelling will happen within at least an hour but I feel fine before it happens at first I thought it might have been a allergy but I feel no tingly feeling or anything of the sort but this is not the first time this has happened and sometimes it switches sides of the face it goes from left to right never my whole face at the same time.