I am in Japan for another 2 weeks and I would really like to understand what I have, because speaking English with the Japanese is challenging.

Based on the symptoms described, it sounds like the individual may have a fungal infection called balanitis. Treatment typically involves using antifungal medications like ketoconazole. It is important to follow the recommended treatment duration to ensure the infection is fully cleared. Using corticosteroid creams like betamethasone may reduce the body's ability to fight off infections and could contribute to the reappearance of symptoms. Maintaining good hygiene practices, discontinuing the corticosteroid cream, and resuming the application of ketoconazole as directed may help alleviate the symptoms.