I used to get them but haven't had one since just before diagnosis, in fact I'd not had one for 20 years and then one popped up about 2 months before I was admitted to hospital and it was still there when I was admitted. Mine was just near the tear duct, and my entire body was dry as a bone, so the dryness apparently caused a resistant infection. They flushed the tear duct for me with antibacterial stuff and then gave me antibiotics which seemed to do the trick. Might be worth another trip to the doctor.
Incidentally an optician told me not to use those eye drops because they're expensive and the doctor can prescribe better options so maybe the GP could help with something less hard on the pocket?