I have gone through your query and understood your concerns. In my opinion that must be an anal abscess
or fistula and you need antibiotic treatment for this. If you were my patient I will suggest you to take tab.amoxicillin
500mg twice daily for 3 days to treat infection and also advise you to make the area clean and dont pop out the thing as there will be more chances of infection instead you can consult a surgeon to know the exact diagnosis and as the drug is prescription drug you need to consult your doctor for this. Thank you.