After reading your history it appears that you might have developed secondary infection over the anal area. The anal area is very prone for getting secondary infection. I advise you to not pinch or pop the area. You can apply an antibiotic cream such as gentamycin
cream. Antibiotic tablet s are must such as ciprofloxacin
under medical advise. If itching is present then can take benadryl
accordingly. Consult your Gynecologist for checking the exact cause. Do not apply vaseline as it can further infect the area.