While several factors may contribute to irregular skin pigmentation, the condition often results from repeated episodes of sunburn, notes MedlinePlus. The look of patchy or mottled skin stems from an overproduction of the skin pigment known as melanin, which your body produces as a defense against the sun’s UV rays.

Lactose intolerance affects 30 to 50 million people in the United States, according to 2013 information reported by the Ohio State University Wexner Medical Center website. It is caused by the lack of a specific enzyme -- known as lactase -- that is normally found in the small intestine.

The term "lazy eye" describes a problem between neural pathways in the brain and eye that result in a loss of vision. Lazy eye exercises for adults are designed to strength the ocular muscles in an effort to correct a lazy eye.

The liver is responsible for filtering every substance that enters and leaves your body. This large organ helps to maintain blood flow and circulation, break down nutrients from foods and distribute nutrients. The liver also prevents toxic chemicals from harming your body.

Concerns about over prescription of antibiotics are not new. In 2000, the Centers for Disease Control and Prevention issued a warning about overusing antibiotics. In November 2010, the organization urged consumers to learn about the proper use of antibiotics.

Women often seek to increase their sex drive or desire, but are too embarrassed to discuss the subject with their physicians. Others can talk about it but aren't interested in taking drugs or medications. For such women, herbal remedies may provide the answer they're looking for.

Your hands are constantly exposed during daily activities, making your fingers prone to injury. Mallet finger occurs when the tendon that straightens the last joint of your finger is torn.

According to The College of Family Physicians of Canada, vomiting and diarrhea can be caused by a number of things, including bacteria, viruses, eating too much or too fast, eating too many sweets and even motion sickness.

An infected pimple occurs when the follicle under your skin’s surface clogs from excess oil, dirt buildup or dead skin cells, which allows bacteria to form and cause the infection. Pimples, or acne, can develop on any area of the skin, but the common areas include the face, chest, shoulders, neck and upper back.

A "charlie horse" is a muscle spasm that can affect any muscle, but they are most common in the legs. The muscle forcefully contracts without your control and it forms a knot and becomes very tight. These can come about when you are least expecting them to happen and they can cause a lot of pain and discomfort.

Humidifiers help restore moisture to dry indoor air, but without proper care and maintenance they can pose a potentially serious risk to health.

Mid-back pain typically arises due to a muscle strain caused by poor posture, lifting an object improperly, or sudden twisting, often during sports such as basketball, golf or softball. You can normally alleviate the pain caused by minor strains quickly if you follow a conservative treatment plan.