Welcome to HCM
We understand your concerns
Nothing to worry. Your doctor know what it is. Visiting General Practitioner is for confirmation. From the description it seems that you have some sort of internal abscess
formed between your anus and testicles. Quite normal during dry season where the area sweats more and such things are formed. Second reason may be due to prostrate gland inflammation which is unlikely as the symptoms don't suite.
Don't worry. Just wash the area with saline warm water and you will be cured.
Get well soon.