Attractive and successful guy asked me for a date twice but I have psoriasis.

I (F42) feel very insecure because of my visible psoriasis. A friend of mine introduced me to a guy (M42) who I find attractive and is successful in life. We are on talking stage and he asked me to go on a date with him twice but I said I am not ready. Should I tell him about my condition? I have not been on a date for many years.