What sort of creams/ointment/lipbalm/lipstick do you use on them now?
You say once every 2 weeks or so, how long does it last each time or do you just get it & then it finally gets better to just start all over again??Or does it happen say when you ovulate & then again at start of period (if you're male sorry & ignore this question!!)
is there anything you do (swimming) or eat(lemons) or anywhere you go (bushwalking)about the time it starts??
You could try vaseline, using lip balm all(repeat all not just when your lips are bad) the time. Not eating acidic foods (tomato, lemon, orange, pineaplle etc).