Dry, burning lips...

Does anyone know whether or not are connected to "my" MCTD/SLE ?
I suffer from very dry, burning lips and the only remedy that helps is Original Vaseline,
which I carefully put on my lips.
I am unable to use any lipstick because as soon as I use it, my lips start burning
and hurting even more.
Does anyone know anything about this symptom ?
I have been wondering if it is connected to my suffering from photosensitivity
and kidney-involvement or whether it is "purely" connected to "my" SLE/MCTD flaring up again....?
Thank you for your thoughts, Kristina.