Tripping on the stairs, dropping an object on your foot or accidently running into something can all result in bruising your skin. Aging, vitamin deficiencies, certain medications and gender can also make you more susceptible to the two types of bruises -- hematomas or ecchymosis.

Cholesterol is a fat-like substance, also called a lipid or sterol, that is made in the liver and circulates in your blood to aid in body processes. Like humans, animals also produce cholesterol, meaning there is cholesterol in meat, milk and eggs.

Small white bumps can appear on the lips because of many different causes. While some types of lip bumps may be benign, others can be symptoms associated with certain medical conditions.

HIV is a blood-borne illness that is most commonly spread via high-risk sexual activities and use of illegal drugs. It can also be transmitted from a mother to child during the childbirth, and via blood products.

Hemorrhoids are swollen veins in the rectum or anus. Although rarely serious, hemorrhiods can be extremely uncomfortable. Several home remedies can help to ease the discomforts associated with hemorrhoids, but it is important to consult a physician if you experience any form of rectal bleeding.

An itchy face and nose can lead to plenty of discomfort. Several different skin disorders can affect the face and nose, leading to the symptom of itching. Some are temporary problems; others are chronic conditions that must be routinely managed. Consult your doctor for the final word if symptoms are persistent.

According to a 2007 review published in the journal "Sleep," almost 20 million children in the U.S. received medical attention for sleep difficulties between the years 1993 and 2004. This treatment often included prescriptions for barbiturate and benzodiazepine drugs.

Vitamin A isn't just consumed orally in vitamin pills. Retinol, a form of vitamin A, is one of many ingredients found in various topical skin care products. It's widely used because it has many applications and uses for the general improvement of your skin's health.

Test anxiety is a type of performance anxiety. People who suffer from test anxiety often have other types of anxiety, in particular social anxiety. Nonpharmacological methods are considered the first line of treatment, but if they fail, or if the anxiety is truly incapacitating, medications can be helpful.

Smoking marijuana can be just as unhealthy and addictive as smoking cigarettes, according to DrugAbuse.gov. Once the decision is made to quit smoking weed, you might have no idea where to start and how to do it.

Allergy to egg is one of the most common food allergies in infants. Allergic reaction to egg usually becomes noticeable when the baby is about 10 months old, according to Dr. Ralf Heine in the March 2006 issue of “Current Allergy and Asthma Reports.

HIV is an acronym for human immunodeficiency virus, the virus that causes AIDS, or acquired immune deficiency syndrome. The Centers for Disease Control and Prevention (CDC) report that the virus attacks the immune system, eventually leaving the body prone to multiple different types of infections.