A small pimple-like swelling near the anus that occasionally discharges thick fluid is most commonly suggestive of a fistula-in-ano (an abnormal tract between the anal canal and skin). It may not always be painful, but persistent discharge is a warning sign. It is unlikely to heal completely with ointments alone. You should consult a general surgeon for proper examination. Early treatment helps prevent complications and repeated infection. Avoid squeezing it, maintain good hygiene, and keep the area dry until you see a doctor.