redness of foreskin

My 66 year old husband has had recurring small area on foreskin (uncircumcised) that has been treated with an antifungal cream. The area clears up but then returns several weeks later. Could Dial soap cause this? He showers daily, wears cotton briefs and cotton shorts or pants. He does exercise daily by walking, riding the bike, or working in the yard for 2 hours twice a week. He doen't shower until after 12 noon after working in the yard or doing home projects. We no longer have sex. Do you have any suggestions for other treatment or care. Thank-you.
Ivra