Hello I appreciate your concern.
At the beginning i would like further information for better assessment of the condition like
Your age and relevant medical history
any history of unprotected sex in recent past?
In my opinion you should wash it with antiseptic solution and keep it clean an moist by applying antiseptic or antibacterial ointment like
mupirocin instead of antifungal cream.
You should take plenty for fluids to maintain good hydration and urine output.
Maintain good hygiene, wear loosely fitted undergarments
If it doesn't subside in 2 to 3 days than you should visit your nearest doctor for physical examination and investigations for STDs.
Hope this answers your question
please feel free to ask for follow up question or if you have any more doubt, I will be happy to help you
Best wishes