I do not remember where I found this information, but I forgot about it. I forgot to try Melatonin liquid on my lips. I read that it caused lip skin to stop overgrowing. It helped to develop a fragile layer of skin (instead of thick layer) that stayed the same. Progesterone cream also had the same effect on the lips, but I would go with the melatonin liquid. I wonder if this is a hormone problem for some.