In-depth

Actinic keratosis

Actinic keratosis is a skin growth that appears as a rough, scaly patch. Left untreated, skin cancer sometimes develops.

Age spots (liver spots)

Age spots tell more than your age. They also indicate how much time you've spent in the sun.

Anhidrosis

Anthrax

Basal cell carcinoma

Most cases of basal cell carcinoma, the most common type of skin cancer, can usually be prevented. Learn how.

Dermatomyositis

Ehlers-Danlos syndrome

Epidermolysis bullosa

Folliculitis

Henoch-Schonlein purpura

Henoch-Schonlein purpura causes inflammation of small blood vessels (vasculitis) and often a purplish rash. It's most common in children ages 2 to 6.

Ichthyosis vulgaris

Krabbe disease

Krabbe disease is a rare, inherited disorder — most often affecting infants — that impairs functioning of the central nervous system and usually leads to early death.

Lichen nitidus

Lichen planus

Lichen planus is an inflammatory disorder that results in lesions on the skin or mucous membranes.

Limited scleroderma (CREST syndrome)

Lipoma

Melanoma

Moles

Neurodermatitis

Pityriasis rosea

Polymorphous light eruption

Polymorphous light eruption is a sun-induced skin rash affecting people who develop a sensitivity to sunlight.

Psoriasis

Though psoriasis can be uncomfortable and sometimes painful, you can take steps to improve your symptoms.

Reye's syndrome

Seborrheic dermatitis

Stubborn, itchy dandruff can be a sign of seborrheic dermatitis. Find out what you can do to treat this flaky skin condition.

Seborrheic keratosis

Older adults often have at least one seborrheic keratosis. Find out if you need to be concerned about this common skin growth.

Skin cancer

Squamous cell carcinoma of the skin

Stevens-Johnson syndrome

Stevens-Johnson syndrome is a disorder of the skin and mucous membranes. Often, this severe adverse reaction is caused by medication or an infection.

Sun allergy

Vitiligo

Feb. 16, 2013