It seems that you may be having intergluteal intertrigo
There may be erythema
,mild scaling,oozing and itching or /and burning.
The cause may be bacterial or fungal infection
Avoid soap bath. You may take Sitz bath in dettol liquid containing water.
Keep the area dry.
Apply antibacterial and antifungal cream.
Take antibiotics with antihistaminics and anti inflammatory drugs.
If needed, short course of steroids
may be taken.
You may get good result.
I hope you got my results.
Dr. Ilyas Patel MD