For the roller coaster, see Sewer Rat (roller coaster) . The brown rat, also referred to as common rat, street rat, sewer rat, Hanover rat, Norway rat, brown Norway rat, Norwegian rat, or wharf rat (Rattus norvegicus) is one of the best known and most common rats.he brown rat is a rather large true murid and can weigh twice as much as a black rat and many times more than a house mouse. The length is commonly in the range of 20 to 25 cm (8 to 10 in), with the tail a further 18 to 25 cm (7 to 10 in), thus being roughly the same length as the body.
Jaundice is the medical term that describes yellowing of the skin and eyes. This condition forms when there is too much bilirubin in your system. Bilirubin is a yellow pigment that is formed by the breakdown of dead red blood cells in the liver. Normally, the liver gets rid of bilirubin along with old red blood cells. Jaundice may indicate a serious problem with the function of your liver, gallbladder, or pancreas. Find an internist near you Â».
Autoimmune Diseases and Allergies. Autoimmune diseases, such as lupus erythematosus and dermatomyositis, can also cause changes in skin color. Eczema is a type of hypersensitivity reaction (allergy) that can cause red, scaly patches that ooze.Related to eczema, pityriasis alba can cause dry, white patches on the skin in children.A wide variety of rashes, such as dermatitis herpetiformis, contact dermatitis, poison ivy rashes, and others can be caused by an allergic reaction.ou may have applied sunscreen in an incomplete manner, leading to differently tanned parts of your skin. Medications can make your skin more sensitive to the sun and more likely to turn red or burn. Radiation therapy may also cause a kind of burn and change the color of your skin.