Sorry for the late reply and inconvenience.
Thanks for all this additional information.
I understand your concern.
And it’s my first privilege to pay attention and provide you with suggestions to relieve your discomfort/ worry.
I reviewed your picture.
Well as you describe, it's a friction-induced lesion.
Now I would recommend some self-care measures like
Do cool water sitz bath with betadine solution twice a day for 5-10 minutes.
You can either try over the counter Vagisil pH balance wash or Simply Summer's Eve gentle foaming wash.
And afterward, apply OTC 1% hydrocortisone cream mixed with Bacitracin ointment.
Use OTC Abzorb powder if you have excessive sweating.
And keep the area dry and clean.
Wear loose-fitting cotton clothes to prevent friction.
Take OTC Motrin and Claritin for a few days.
RepHresh Pro-B probiotic supplement that balances yeast and bacteria to maintain feminine health with just one capsule per day.
If your symptoms will persist then see your doctor for further evaluation and management.
Hope I have been able to clarify the situation for you and helped in resolving your query.
Let me know if you have any further queries so we can discuss it thoroughly in every aspect.
It’s my pleasure to continue this conversation until you satisfy.
Waiting for your response.