Skin problems on the penile shaft

I dont have intercourse often with my partner but I do get oral sex atleast 3-4 times on a weekend period. I have very dry skin and bathe with Dove soap and recently switched to Oil of Olay soap to compare the better. I have dryness appearing on the shaft of my penis and am afraid to apply anything on it other than Aquaphor which is a moisturizer like vaseline. Am I having to much oral sex or is it a skin problem? And one more question......I have slight ezceyma that I treat with 0.3% Protopic Ointment on my hips daily after showers and Aquaphor by Eucerin before bed, it flared up and went away then came back and will not go away. Although over time it has become more moisturized than normal and has slightly went away should I continue using it or go to a doctor for treatment? (The Protopic ointment is treatment for my niece that has severe ezceyma is the reason I use and have access to Protopic treatment.)