This award-winning picture shows a cyst on the corner of this 54-year-old man's eye just before surgery.
This picture was a bronze award winner in the 2009 Institute of Medical Illustrators awards and was taken by Abbey Staplehurst at Addenbrooke's hospital.
This is the fourth in our series of clinical pictures which will be published every week. Check back here to see future pictures.
52 year old male before undergoing surgery for the removal of a large cyst on corner of eye (Copyright: Addenbrookes Hospital, Cambridge University Hospital's NHS Foundation Trust)