Thank you for your query at DoctorSpring.com
There are few possibilities. As it is present for nearly 2 months, it's not simple infection.
1.It could be an external opening of fistula.It will discharge some material for some time and gets closed.The internal opening should be made out.Then, the whole fistulous tract has to be managed.
2.Second possibility is Sinus.It could be ending in a blind area.Then, it has to be removed surgically.
3.Third possibility is Boil.It is due to infection. Drainage and antibiotic along with anti inflammatory tablet is needed.
These conditions have to be diagnosed after clinical examination by Surgeon.
Please consult your Surgeon and get examined clinically.
Nothing to worry. If you have any questions, I will clarify further.
Wish you good health.