A<unk> , also known as tear duct<unk>  or lacrimal<unk> , is a small medical device that is inserted into the tear duct <unk>  of an eye to block the duct. This prevents the drainage of liquid from the eye. They are used to treat dry eye. Artificial tears are usually still required after<unk>  insertion.
Punctal plug
Anal plug
Nipple discharge
Perforated eardrum
Mucocele
Protruding ear
Lethal midline granuloma
Cimino fistula