Based on your description, the swelling you are experiencing is most likely a perianal abscess/fistula.. You need to be evaluated by a healthcare professional, such as a general surgeon or a proctologist. Since this has been happening for 10 days without relief, an in-person physical exam is necessary to get an accurate diagnosis and prevent complications like a severe infection.
In the meantime:-
1. Avoid Straining.
2. Eat High-Fibre Foods
3. Continue Sitz Baths safely
4. Do Not Squeeze the Lump
Next Steps
consult a general surgeon or a proctologist