Hello,
Thank you for your query at DoctorSpring.com
You seem to have a fungal infection between the genital area and your anus region.
It is better you apply Neosporin AF ( Monistat ) 2-3 times daily. Some doctors recommend using Tab. ketoconazole, however the side effects are comparatively more than Neosporin. So try Monistat ointment for 5 days. It should resolve.
Hope this was helpful,
Regards.