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Balanitiscan be either bacterial, fungal, viral or non-infectious. The most common being fungal. It is difficult to say without seeing your clinical picture. Please attach your clinical picture along with your query so that it is convenient for me to comment on your condition and give you the appropriate medications.
Do you have itching, burning, pain, blister or oozing? Since how many days do you have this? Are you sexually active? Is there any history of unprotected sexual contact? If so, inquire your partner for white discharge. Are you on any medications for other systemic diseases like oral systemic steroid for asthma? Have you done blood test for diabetes?