Cold sores -- also called fever blisters -- are a painful infection caused by the herpes simplex virus (HSV).

Plantar warts and palmar warts are common, especially in children. These warts are named for where they appear on the body.

A single blister is usually the result of friction or a minor burn, typically on the hands or feet.

Chafing can occur anywhere on your body, but the thighs, groin, underarms, and nipples are particularly vulnerable.

Corns and calluses can be annoying, but your body actually forms them to protect sensitive skin.

Here's what you need to know about how to keep your skin safe and where to find sunburn relief.

Sometimes dead skin can clog up a hair follicle. That forces the hair inside it to grow sideways under the skin.

Muehrcke's lines appear as double white lines that run across the fingernails horizontally.

Gangrene is a condition that occurs when body tissue dies. It is caused by a loss of blood supply.

A rash indicates an abnormal change in skin color or texture. Rashes are usually caused by skin inflammation.

In most people, the early stages of dermatitis are characterized by red, dry, and itchy skin.

Bedbugs are small, oval, brownish insects that live on the blood of animals or humans.

Pruritus simply means itching. It can be associated with a number of disorders.

You might have an itch that must be scratched. Or a tickle on your back that you can’t reach.

An itch can be triggered by something outside your body, such as poison ivy, or by something on the inside, such as psoriasis.

There are a number skin conditions that cause lumps and bumps to appear on the surface or just below the skin.

Urticaria, also known as hives, is an outbreak of swollen, pale red bumps or plaques (wheals) on the skin that appear suddenly.

Alopecia is the medical term for baldness; there are various types of alopecia, including alopecia areata.

Intertrigo is a fancy name for a rash that shows up between the folds of skin. It is a very common skin rash.

The thought of lice might give you the creepy crawlies -- and with good reason. When these tiny mites infect the scalp and skin.

Scabies -- or human itch mites -- are eight-legged critters that burrow into the upper layer of your skin.

Poison ivy, poison oak, and poison sumac are plants that can cause a temporary rash when they come in contact with your skin.

A bruise is a common skin injury that results in a discoloration of the skin.

Many people often call any small, painless lump under the skin "sebaceous cysts." But those are most often epidermoid cysts.

Does scaly skin have you itchy and uncomfortable? It may just be ordinary dry skin.

Psoriasis is a common skin disorder that produces thick red plaques covered with silvery scales.

Rosacea is a common disorder that mainly affects skin on the face. It causes redness on the nose, chin, cheeks, and forehead.

Vitiligo is a condition in which white patches develop on the skin. Any location on the body can be affected.

Leprosy is caused by a slow-growing type of bacteria called Mycobacteriumleprae (M. leprae).

A carbuncle is a red, swollen, and painful cluster of boils that are connected to each other under the skin.

A staph infection often begins with a little cut, which gets infected with bacteria.

Cellulitis is a common infection of the skin and the soft tissues underneath.

Impetigo is a highly contagious bacterial skin infection. It can appear anywhere on the body but usually attacks exposed areas.

A boil is a skin infection that starts in a hair follicle or oil gland.

A pilonidal cyst occurs at the bottom of the tailbone and can become infected and filled with pus.

Fungal infections of the skin are very common and include athlete's foot, jock itch, ringworm, and yeast infections.

Worms don't cause ringworm. Rather, this superficial skin infection, also known as tinea, is caused by fungi called dermatophytes.

Athlete's foot is a common fungal infection, and you don't have to be an athlete to get it.

Candidiasis is an infection caused by a group of yeast. These fungi live on all surfaces of our bodies.

This mold is found on rose thorns, hay, sphagnum moss, twigs, and soil. Therefore, the infection is more common among gardeners.

A fungal nail infection occurs when a fungus attacks a fingernail, a toenail, or the skin under the nail, called the nail bed.

Molluscum contagiosum is a viral skin infection that causes either single or multiple raised, pearl-like bumps on the skin.

Birthmarks are colored skin spots that either are present at birth or develop shortly after birth. They can be different colors.

There are many skin lesions that are common and benign. These include moles, freckles, skin tags, and many more.

Whether you're newly diagnosed with chronic spontaneous urticaria or are already in treatment, learn how to make the most of your doctor appointment.