Thanks for posting your query.
With the available described symptoms, there appears to be high chances of thrush
or yeast infection.
Yeast infection or thrush is caused by a normal commensal fungus "Candida Albicans" present in human beings.
Human body has normal protective mechanism to prevent proliferation of candidia
albican but it gets proliferated after breech in immune system.
You should consult with dermatologist
or internal medicine specialist and should go for thorough check up.
Kindly don't apply water and soap at vagina as it will remove protective mechanism and give opportunity to candida albicans.
You should apply terbinafine
ointment at affected site.
Solution is used for bacterial infection and acts as antibiotic lotion.
Dr. Mayank Bhargava