Hello. I'm A 40 Year Young Lady. I Have Been

Hello. I'm a 40 year young lady. I have been having badly chapped lips for about a week and half. I was thinking it had something to do with the eczema on my scalp or psoriasis in my face (the psoriasis is not bad...my mother, brother and two of my daughters have it also). I can't think of anything that i could be allergic to. I take bystolic 5mg for my heart vitamin e and a green tea vitamin. Im 256 pounds and I walk at least two miles three or four times a week. I've been using carmex for years. What could be causing my lips to be so badly chapped? What can I use for them?