Melissa: The swelling sometimes happens to me too. First, stop using the particular lip product and just keep lips hydrated with plain ol’ lip balm.
But if it still keeps happening or starts to hurt, it’s advisable to see a dermatologist for a proper assessment. If it is uncertain what is causing the reaction, the doctor will perform a patch test.
To help heal serious inflammation, you may be given a steroid ointment, and antihistamines.