Cyst tract on nose i was born with, has recently become sore on and off and sometimes puss n blood come out. doctors said benign, but should i worrry?

Possible infection: It is possible to get a build up of secretions in a congenital dermal sinus tract which can get infected from time to time, and this would cause pain and swelling, which can be uncomfortable and may need treatment. Usually these do not connect to deeper tissues, and surgical excision can be very complicated and is not usually recommended unless there are recurrent problems.