Thank you for your medical query at AskTheDoctor.com
I understand your concern.
Any kind of sore on the genitalia needs to be examined in person for a conclusive diagnosis. However, a white colored sore is most likely to be from a bacterial infection, and you can apply Mupirocin ointment on the sore 2-3 times daily. If it does not respond to Mupirocin kindly get it examined by your physician for further diagnosis.
Hope this was helpful,
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.