Is there a treatment to prevent balanitis?

It is yeast: Balanitis is a yeast dermatitis a healthy balanced diet can prevent as can good hygiene. Probiotics orally can help balance the intestinal bacteria and ca n prevent infection. Using vinegar and water as a rinse in the shower or as a wipe in a baby can also help as vinegar breaks up the cell walls of yeast.

Here ...: Temporary but possibly sustaining, measures are clean ; dry foreskin regularly especially after each peeing; keep the foreskin and glans air-ventilated as much as possible; timely and thinly use antifungal/bacterial steroid carem, and occasional oral antibiotics or antifungal agent; avoid paraphimosis. "permanent" is circumcision + good hygiene + good diabetic control if any.