Dandruff, known medically as sebhorreic dermatitis, causes white flakes of dead skin to shed from the scalp. According to MayoClinic.com, possible causes for dandruff include sensitivity to hair care products, shampooing too frequently or infrequently, eczema, and psoriasis.

The pH scale measures the acidity or alkalinity of a substance. Your skin has a pH measurement too. When substances with different pH levels come into contact, chemical reactions often occur. The soaps, lotions and other products you use can have an effect on the pH, and thereby the health, of your skin.

Hair loss can be devastating for many people. Your hair is often one of the first things people notice about you, and if it's falling out and noticeably thinning, you might understandably feel self-conscious and even unattractive. Fortunately, some causes of hair loss are relatively easy to address.

Running is an effective cardiovascular exercise that can help you burn calories quickly and reduce your chance of contracting conditions like high blood pressure, diabetes and heart disease. If you want to lose weight, running regularly can help you reach your goals.

Eczema is a dermatological condition that causes itchy red patches on the skin and is sometimes referred to as dermatitis. Eczema is most commonly found in children, but it can affect adults. Dr. Susan Taylor’s BrownSkin.

Skin tags, or acrochordons, are benign, skin-colored growths that develop primarily in areas where the skin folds, such as under the arms or on the neck or eyelids.

Ringworm on the arms is also referred to as tinea corporis. Contrary to the name, worms do not cause the skin condition. This common fungal infection of then skin is highly contagious.

Some people break out in red bumps and lumps when wool touches their skin. However, in many cases, a reaction to wool isn't due to allergies. Instead, direct skin contact with wool often causes irritation because of the slightly scratchy nature of some woolen clothing or because of chemicals in the fabric.

Itchy hands at night may be the result of several different skin conditions, some of which can seem worse in the evening or when you're trying to sleep.

Human hair gets greasy when it is not washed enough, but some people naturally have oily scalps, even if they shampoo frequently. This can lead to a condition called seborrheic dermatitis, more commonly known as dandruff, according to the National Institutes of Health, or NIH.

Skin color results from the blood flow in the tiny vessels within the skin as well as the amount of pigment present in the dermal layers. Any number of normal conditions can alter the pigmentation of the skin, but only abnormal causes result in bluish discolorations.

Salicylic acid is a type of beta-hydroxy acid derived from willow bark. A natural exfoliant, the acid is commonly used in topical treatments for aging, sun-damaged skin and acne-prone skin.