This common skin condition is the formation of multiple blemishes on or just beneath the surface of the skin. These blemishes commonly appear on the face, neck, chest, shoulders and back. Acne can affect anyone, but it most commonly affects adolescents and young adults.

This condition, also known as solar keratosis, is a common precancerous growth that develops on the skin. It is characterized by small, rough patches called keratoses. These growths are most commonly found on the face, hands, forearms and neck, and should be examined by a doctor.

This condition is characterized by flat, brown, gray or black spots that appear on the face, hands, arms and shoulders. Age spots are most commonly found in adults over age 40 and are usually harmless. Although age spots are also known as liver spots, they are unrelated to liver function.

An allergic reaction is your body's response to an allergen. Reactions can vary from person to person, and from allergen to allergen. They can affect many systems of your body, and they can range from mild to severe.

This is a disease that causes your hair to fall out in round patches. It happens when your body attacks the cells that make your hair. This disease is not dangerous or painful. But it can be very upsetting.

This is a viral infection. It usually results in an itchy rash and mild sickness that lasts for five to 10 days. This virus spreads easily among children. In the past, contracting chickenpox was a routine part of childhood for most people. But a vaccine has made infections much less common.

A cutaneous cyst is a benign, saclike growth containing fluid or semi-solid material that forms beneath the skin. Most cysts are harmless, although some can enlarge and become swollen and painful.

If you have dry skin, you know how uncomfortable it can be. Dry skin can be itchy, flaky and sensitive. For most people, it's a minor nuisance that's easy to treat. But in some cases it can be a chronic problem that lasts a long time.

This is a name for several forms of swelling of the skin. We also call it "dermatitis." In many people it affects the cheeks, the insides of the elbows, or the skin behind the knees. You may have dermatitis on your hands or feet, or on your buttocks. It isn't a contagious condition.

This skin and tissue damage comes from extreme cold. Frostbite can happen to any part of your body. And it can be very serious.

If you have experienced hair loss, you know it can be unsettling. It's a common issue that happens for many reasons. It can happen to anyone at any age.

This is a common viral infection. It causes small sores on or around your genitals, your buttocks or your anal area. They can also form around your mouth.

This is a common viral infection. It can cause small sores that we call "cold sores" or "fever blisters." Usually, these form on or around the lips or in the mouth.

These are red, raised areas that form on the skin. They're often itchy. Hives can range in size from small to large, and they can develop anywhere on your body.

This is a common skin condition. It causes patches of small, rough bumps on your skin. The bumps are harmless. They don't itch or cause pain.

This is a surgery for skin cancer. With this technique, the surgeon carefully studies tissue as it is removed to make sure no cancer cells are left behind. It's often used for cancers of the face and neck. It can be good for cancers that are rare or aggressive.

Although most skin moles are harmless, sometimes they turn into cancer. Skin cancer can be deadly, but many types of skin cancer can be treated successfully if caught early. So if you have a mole, it's important to watch it closely for warning signs of cancer. You can remember the warning signs by remembering "ABCDE."

This type of infection is caused by a strain of bacteria that is resistant to many antibiotics. Because of this, it is hard to treat. A MRSA infection can cause serious complications. It can be life-threatening.

This condition is a nail infection that develops when microscopic fungi penetrate the skin between the nail and the nail bed, causing the nail to become discolored, brittle and thick.

This non-invasive outpatient procedure uses a topical, light-activated medication to eliminate precancerous lesions of the skin. PDT can also help rejuvenate the skin, softening the appearance of wrinkles and scars.

This condition is an inflammatory reaction caused by contact with urushiol, an irritant found in the sap of some species of plants (most notably poison ivy, poison oak, and poison sumac). Even a tiny amount of this oil is enough to cause a reaction in most people.

This is a mark on the skin that is present at birth. Often, it's on the face. But it can form anywhere on your body. These birthmarks can be any size, from small to very large. A port-wine stain isn't usually harmful, but for some people it can be embarrassing or disfiguring.

This condition is a common skin disease that can cause dry, itchy, painful patches of skin. Psoriasis is a chronic condition.

This is an infection that causes red, circular rashes on your skin. Ringworm of the body can affect the skin anywhere except your scalp, your groin, the soles of your feet and your palms. But ringworm of the body is just one of many forms of ringworm infections. There are other, closely-related infections such as jock itch and athlete's foot that can affect other parts.

This is a skin disease. It affects your face, and sometimes your eyes. It causes red, thickened skin and other problems, which begin as flare ups but over time become more permanent. This can be troubling and embarrassing.

Scar formation is the body's way of healing the skin after injury. A scar's appearance depends largely on the type of wound and where it is on the body, but other factors such as age, sex, ethnicity and heredity can play a role as well. Scar tissue is different than normal skin in both texture and color. Scars may fade over time or with treatment, but they will never completely disappear.

This is a group of autoimmune diseases. They cause your body to make too much collagen. Collagen is a fibrous tissue found in your skin and other parts of your body. Scleroderma affects systems throughout your body. And for some people, it can lead to serious problems.

These noncancerous, warty growths form on the outermost layers of the skin. These superficial patches resemble scabs, and are sometimes called barnacles.

This is a viral infection that usually affects older people. It makes your skin break out in a rash that can be very painful.

This is the most common form of cancer. It often happens on body parts that get a lot of sun, like your head, face, neck, arms and hands. Anyone can get skin cancer, but it's more common in older people and in people who have light skin, hair and eyes.

Spider veins are tiny varicose veins that appear as thin, squiggly lines just under the skin. They are common on the legs and the face, and most frequently affect women.

This is an uncomfortable and often very painful skin condition. With it, your skin becomes red, tender and warm.

If you have swollen, twisted veins beneath your skin, you have varicose veins. Most often, they are found in the legs and the feet. They can be painful, and many people feel embarrassed by them.

This disease affects the skin and hair. With it, you develop areas that have no pigment. You'll see white splotches on your skin. And areas of your hair may turn white. Over time, these areas can grow larger. While vitiligo isn't harmful, it can make you feel unhappy with the way you look.

Warts are small, rough skin growths that typically occur on the hands and feet. They may occur singly or in multiples, and may spread to other parts of the body. Warts are caused by the human papillomavirus (HPV) and are contagious.

Wrinkles are a natural part of the aging process that almost all people experience to some degree. Wrinkles are typically most noticeable around the eyes, lips, neck and hands.