Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain a painful bump near the anus that is painful and cause difficulty in sitting or standing can be most probably a Personal
abscess..
It can occur due to clogged glands in that area along with accumulation of bacteria that causes infection leading to pus formation and there is a pus filled bump know as an Abscess..
A confirmatory diagnosis can be done after consulting a
Proctologist who can do a clinical evaluation and in case of Personal abscess he can advise you to take a course of antibiotics, anti inflammatory painkiller, topical application of antibiotic and
steroid ointment..
You can also be advised cool compresses..
Keep the area dry and clean..
In case if the resolution is slow
Incision and Drainage can help in faster resolution..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.