Melanoma is a very dangerous form of skin cancer that readily spreads via lymph nodes to other parts of the body. Melanoma originates in the melanocytes, the cells that produce pigmentation or coloring of our skin, hair and eyes, according to the Skin Cancer Foundation.org.

The National Rosacea Society estimates that while 16 million Americans suffer from rosacea, many know little to nothing about it.

Skin rashes are a common sign of an allergic reaction. Anytime you use a new supplement or medication, you are at risk of developing an allergic reaction.

The appearance of an allergic reaction and viral rash is often similar, but the cause of these rashes is entirely different. A rash is rarely serious, but sometimes it can indicate an underlying illness that requires treatment. If you or your child has an unexplained rash, consult your doctor for an accurate diagnosis.

Despite its name, ringworm is not caused by a worm or other parasite; instead, it is caused by a fungal infection. It is characterized by red, circular patches on your skin, and can cause itching, blisters and temporary bald patches.

Although ringworm has nothing to do with actual worms, it is still not a very pleasant condition to have. Ringworm is a skin infection caused by fungus and creates scaly patches of skin that sometimes are circular and resemble the shape of a ring. This condition is highly contagious and spreads easily.

A rash that appears due to humidity and clothing may be heat rash. Heat rash is prevalent during the hot summer months and is caused by blocked sweat ducts and trapped perspiration. Heat rash symptoms may also include itchy skin, painful red bumps as well as lack of sweating in the affected area.

Excess caffeine does not cause skin rashes, but if you’re allergic to caffeine rashes may develop when you ingest a small amount of the substance. Drugs.com states that skin rashes are a severe side effect when using caffeine, one that needs to be evaluated by your health care provider.

Infections and allergic reactions can cause a raised, pimple-like rash that's unrelated to acne. Any time you see unexplained changes on your skin or experience a rash that continues getting worse, see a doctor.

Rashes and stomach aches are common in children and are rarely serious, but when your child has them it can be scary. A stomach ache can make your child feel miserable, and you may worry if he isn't eating or drinking as much as usual or starts vomiting.

A red, itchy rash on the hands can be enough to ruin your day. The itchiness is bothersome and distracting, and its location on the hands means the skin is constantly exposed.

According to the University of Maryland Medical Center, a rash is defined as any change in the texture or color of the skin. A skin rash on the hands and feet may be caused by an external irritant such as poison ivy or may be the symptom of an illness.