chromodacryorrhea MP:0013468 MPheno.ontology bloody tears red lacrimal secretion red tears shedding of red or blood-stained tears due to continuous or excessive secretion of porphyrin from the Harderian gland; as these secretions overflow from the eye and drain through the nasal passages to exit the nares dark rust-colored staining, or crust, can be seen around the eyes and nostrils; these secretions may be transferred to the paws and muzzle during grooming; red tears may be associated with nutritional deficiencies, chronic physiological stress, chronic light exposure, or dacryoadenitis abnormal tear production