Follow theses links to learn more about skin conditions and diseases from the American Academy of Dermatology.

Acne

Acne is a skin condition that is common among adolescents and is characterized by pimples, usually on the face.

Actinic Keratoses

This is a skin lesion that can cause rough, scaly patches on your face, lips, arms, ears, hands, scalp and neck. It's caused by overexposure to the sun, afflicts older adults and can develop into skin cancer.

Alopecia Areata

Sometimes called spot baldness, this condition can cause hair loss and result in bald spots on your body, usually the scalp.

Atypical Nevus

Often resembling a mole, atypical nevus or dysplastic nevus is a benign growth that is not cancerous but can indicate the presence of a cancerous growth. They vary in appearance but appear as an evolving abnormality on the skin.

Basal Cell Carcinoma

The most common form of skin cancer, basal cell carcinoma is a result of unprotected exposure to the sun. It doesn't usually spread into the bloodstream; instead, it destroys tissue surrounding it.

These common conditions can occur at any age and are caused by a number of factors. Keratosis pilaris is an inherited skin condition that develops in up to 40 percent of the population.

Eczema/Atopic Dermatitis

Frequently described as "the itch that rashes", atopic dermatitis is a type of eczema, a common skin condition that can lead to itchiness. Ten to 20 percent of children develop this condition.

Herpes Zoster

A painful condition also known as shingles, herpes zoster is characterized by a red rash, usually on only one side of the body.

Hair Loss

Whether you're losing your hair in clumps or gradually, the condition can usually be treated.

Granuloma Annulare

Granuloma annulare is a raised, bumpy or round lesion on the skin. It is more common in children and young adults.

Fungal Infections of the Skin

Also called tinea versicolor, a fungal infection can affect the skin or nails and is quite common and contagious. Tinea versicolor usually produces few symptoms.

Common Growths

Many common growths develop on human skin. Some are associated with aging, and others are inherited.

Bullous Disease

This is often characterized by blisters and can signify an autoimmune disorder in which the body's immune system malfunctions.

Hyperhidrosis

This condition causes excessive sweating.

Lichen Planus

An inflammatory disease of the skin and mouth, Lichen planus affects about one to two percent of the population.

Lupus and the Skin

Lupus erythematosus causes lesions on the skin.

Malignant Melanoma

Melanoma is the deadliest form of skin cancer. Though it can spread rapidly, melanoma has a high cure rate when detected early and properly treated.

Melasma

Melasma is a common skin condition that causes brown to gray-brown patches, usually on the face.

Moles

Though moles are common, it's important to know that they can increase the risk of developing skin cancer.

Molluscum Contagiosum

A common skin disease that is contagious, molluscum contagiosum is characterized by small, flesh-colored or pink growths that often become red or inflamed.

Nail Fungus & Nail Health

An unsightly but treatable disorder, a nail fungal infection may begin as a white or yellow spot under the tip of a fingernail or toenail. As it spreads, it can cause the nail to discolor and thicken.

Perioral Dermatitis

A common skin problem that tends to affect young women, perioral dermatitis is characterized by redness of the skin and mouth and, usually, small red bumps or pus pumps and mild peeling.

Pityriasis Rosea

Pityriasis rosea is a rash that's most common in those between those 10 and 35 years old.

Pruritus

This is an itch or a sensation that makes you want to scratch. It can occur with or without a rash.

Psoriasis & Psoriatic Arthritis

Psoriasis is a skin condition that is characterized by patches of raised, reddish skin covered by silvery-white scale. Patches can occur anywhere, but usually form on the elbows, knees, lower back and scalp.

Rosacea

A common skin disease that frequently begins as a tendency to flush or blush easily, rosacea eventually can cause persistent redness in the center of the face.

Scabies

Often hard to detect, scabies causes an itchy skin condition that disappears quickly with treatment.

Seborrheic Dermatitis

Seborrheic dermatitis is characterized by a red, scaly, itchy rash and usually develops on the head and chest.

Seborrheic Keratoses

Usually beginning as small, rough bumps, these benign growths tend to thicken and eventually resemble warts.

Skin Cancer

Skin cancer is the most common form of cancer. Fair-skinned individuals who sunburn easily are at a particularly high risk for contracting it.

Squamous Cell Carcinoma

This is the second most common type of skin cancer. Like basal cell carcinoma, it is not a melanoma and is caused by overexposure to the sun's ultraviolet rays.

Tinea Versicolor

A common skin condition, tinea versicolor results in a fungal infection that causes uneven skin color, scaling, and itchiness.

Vascular Birthmarks

Many babies – 1 in 10 – are either born with birthmarks or develop them within the first few weeks of life. They are caused by an increased number of blood vessels in the skin.

Vitiligo

This is a condition that causes the skin to lose color. It commonly begins on hands, forearms, feet and face.

Warts

Warts are non-cancerous skin growths caused by a viral infection in the top layer of the skin. Warts are usually skin-colored and feel rough to the touch, but they can be dark, flat and smooth.