How a polyp biopsy is taken depends on the location: 1  Colonoscopy or flexible sigmoidoscopy explores the large bowel. 2  Colposcopy-directed biopsy examines the vagina and cervix. 3  Esophagogastroduodenoscopy (EGD) or other endoscopy is used for the throat, stomach, and small bowel.  Laryngoscopy is used for the nose and throat.
11 doctors agreed: Several: Possible causes of pink eye (conjunctivitis) include bacterial or viral infection, allergic reaction, rosacea, dry eye, and autoimmune disease.
There are four main causes of pink eye: Viruses; Bacteria; Allergens (like pet dander or dust mites) Irritants (like smog or swimming pool chlorine) that infect or irritate the eye and eyelid lining; It can be difficult to determine the exact cause of pink eye because some signs and symptoms may be the same no matter the cause.