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Dry skin is a very common skin condition. It can make your skin feel irritated and itchy. Dry skin often worsens in the winter when the air is cold and dry. Bathing often also makes it worse. With no treatment, dry skin may become flaky or scaly.

Cold sores are small blisters around the mouth, caused by the herpes simplex virus. They are sometimes called fever blisters. The most common strain of the virus causing cold sores is herpes simplex virus 1. It can be spread by kissing or sharing eating utensils or even sharing towels.

This test is done to find out if you have abnormal proteins in your blood. They can be a sign of rheumatoid arthritis, lupus, or Raynaud's syndrome, among other illnesses.

The direct antiglobulin test, or direct Coombs test, is a blood test used to diagnose a type of anemia caused by your immune system.

This test checks for a deficiency in a protein in the blood known as Factor X. This protein helps with clotting.

This test tells whether your body is able to break down lactose, a sugar found in milk and other dairy products. If you can't digest lactose, you have lactose intolerance.

This test measures and checks the amount of lithium in your blood. Lithium is a medicine used to treat certain psychiatric illnesses.

This test measures the amount of rubella antibodies in your blood. If you're pregnant, it's especially important to know if you have immunity against this virus.

This test looks for high levels of salicylate, the main ingredient in aspirin. It may be used to diagnose an aspirin overdose or to keep track of people taking high doses for arthritis.