Bumps on the white part of the eye might be so small that they are only a cosmetic annoyance or they can be so large that they hinder your vision. Most bumps are harmless and will grow and shrink over time, but sometimes these bumps signal a more serious medical condition.

The erythrocyte sedimentation rate (ESR) is a commonly performed test but is very nonspecific, which means that having a high ESR does not necessarily tell your physician what is wrong, only that something may be wrong.

Donating blood is a generous life-saving gift which is tolerated very well by most donors. But some donors, especially teen donors, may experience side effects from donating blood. Most effects are minor but less than 1 percent of blood donors may experience more severe side effects.

Fine, spidery blood vessels on the face -- referred to as facial telangiectasia -- are a common cosmetic complaint. They are often described as broken blood vessels, but are actually blood vessels that have enlarged and aggregated near the surface of the skin.

Medical procedures to remove blood clots become necessary when the clots threaten to travel from a vein to the heart, lungs or brain, leading to potentially fatal conditions. Deep venous thrombosis, also called deep vein thrombosis, forms bloods clots deep in the veins, usually in the lower leg and thigh.

Bilirubin is a byproduct of the liver processing waste. When the liver isn’t functioning properly, bilirubin may begin to build up in the body.

Your blood sugar is the amount of glucose circulating within your bloodstream. Glucose enters your blood when you eat foods rich in carbohydrates, which are broken down into glucose.

Even though we think of it as a liquid, blood is essentially a living tissue within the body. Its purpose is to transport useful products from one part of the body to another. To function in this capacity, blood consists of two parts: plasma and cells.

Hypercalcemia is a condition marked by elevated levels of calcium in your bloodstream. Although calcium is necessary for bone health and proper heart function, too much calcium in your blood can cause symptoms such as gastrointestinal problems, irritability, bone pain and increased risk of fracture.

Normally blood sugar levels should be less than 126 milligrams per deciliter, or mg/dl. But in cases of high blood glucose, which is also known as hyperglycemia, levels are 160 mg/dl or above.

Blood delivers oxygen and nutrients to your cells while it removes waste products. Good blood circulation is important not only for working muscles, but also for your skin. According to Acne Magazine, good circulation is vital for healthy skin, especially your face.

Hypercalcemia is an excessive level of calcium in the blood and can be the result of various medical conditions such as primary hyperparathyroidism, kidney failure, cancer, excess vitamin D levels and too much calcium in the diet or from supplements.