This is Dr Basu, Experienced Specialist.
I am here to address your concerns and provide great service.
Extreme itching can be caused by th anal eczema commonly.
heat and sweat can cause eczema type rash.
Another common possibility can be fungal infection around the area.
This can coexist with eczema.
Lastly, there can be pin worms causing extreme itching usually at night time.
So a clinical evaluation with your doctor is better.
Following over the medications can be tried meanwhile:
ointment twice daily.
2. Hydrocortisone ointment twice daily
Please avoid sugary food and drinks for now.
It was my pleasure to help you today.
If I have answered all your questions, Please click on Excellent service so that the website allows me to assist you further :)