actinic keratosis Sun-Damaged Skin Although most people love the warmth and light of the sun, too much sun exposure can significantly damage human skin. basal cell carcinoma Basal Cell Carcinoma Basal cell cancer is the most common form of skin cancer diagnosed in the United States. Basal cells are small, round skin cells normally found in the upper part of your skin. melanoma Melanoma Melanoma is cancer of the cells that give skin its color. squamous cell carcinoma Squamous Cell Carcinoma of the Skin Squamous cells are small, flat skin cells in the outer layer of skin. When these cells become cancerous, they typically develop into flat or raised, rounded skin tumors. Sometimes the skin around the tumors gets red and swollen. acne Acne Acne is a common skin condition caused by inflammation of the hair follicles and oil-producing (sebaceous) glands of the skin. eczema Eczema Eczema is the most common type of dermatitis (inflammation of the skin). Eczema refers to several conditions that share a pattern of changes in the surface of the skin. bedsores Bedsores (Decubitus Ulcers) Bedsores, also called pressure ulcers or decubitus ulcers, are areas of broken skin that can develop in people who: have been confined to bed for extended periods; are unable to move for short periods; use a wheelchair or bedside chair. chloasma Melasma (Chloasma) Melasma (also called chloasma) is a condition in which portions of the skin become darker than the surrounding skin. contact dermatitis Contact Dermatitis Contact dermatitis is a form of skin inflammation that occurs because the skin has been exposed to a substance that irritates it or that causes an allergic reaction. dermatofibroma Dermatofibroma Dermatofibromas are small, benign skin growths that can develop anywhere on the body but most often appear on the lower legs. dry skin Dry Skin Normal skin has a soft, supple texture because of its water content. friction blisters Friction Blisters A friction blister is a soft pocket of raised skin filled with clear fluid caused by irritation from continuous rubbing or pressure. hives Hives (Urticaria) Hives, also called urticaria, are circumscribed swellings on the skin that often are itchy. keloids Keloids Keloids are raised overgrowths of scar tissue that occur at the site of a skin injury. ichthyosis Ichthyosis Ichthyosis is the term for severe, persistent problems with dry skin that start in childhood or infancy and may be caused by a genetic abnormality. melasma Melasma (Chloasma) Melasma (also called chloasma) is a condition in which portions of the skin become darker than the surrounding skin. moles Moles (Nevi) Moles are small, pigmented spots on the skin that usually appear during childhood or adolescence, although they are sometimes present at birth. sun allergy Sun Allergy (Photosensitivity) A sun allergy is an immune system reaction to sunlight, most often, an itchy red rash. pityriasis rosea Pityriasis Rosea Pityriasis rosea is a harmless skin disease that causes scaly patches that sometimes itch over the torso, neck, arms and legs. psoriasis Psoriasis Psoriasis is a chronic skin disorder that causes scaling and inflammation. Psoriasis may develop as a result of an abnormality in the body's immune system. Raynaud's phenomenon Raynaud's Phenomenon Raynaud's phenomenon is a blood vessel disorder. The condition is also called Raynaud's disease or Raynaud's syndrome. rosacea Rosacea Rosacea is a common, long-lasting skin condition that causes inflammation and redness of the face. scleroderma Scleroderma Scleroderma is a poorly understood illness that causes widespread hardening of the skin, especially on the hands and face. It also can damage the lungs, heart, kidneys, digestive tract, muscles and joints. sebaceous cysts Sebaceous Cysts Sebaceous cysts are small lumps that arise within the skin on the face, upper back and upper chest.. seborrheic keratoses Seborrheic Keratoses Seborrheic keratoses are benign (noncancerous) skin growths that develop from skin cells called keratinocytes. skin tags Skin Tag (Acrochordon) A skin tag is a soft, skin-colored growth that hangs from the surface of the skin on a thin piece of tissue called a stalk. vascular birthmarks Vascular Birthmarks A vascular birthmark is a discoloration of the skin that is caused by blood vessels that don't form correctly. vitiligo Vitiligo Vitiligo consists of white patches of skin that are caused by the loss of melanin, the pigment that gives skin its color. boils Boil and Carbuncle Boils and carbuncles are localized skin infections usually caused by Staphylococcus aureus bacteria (staph). carbuncles Boil and Carbuncle Boils and carbuncles are localized skin infections usually caused by Staphylococcus aureus bacteria (staph). cellulitis Cellulitis Cellulitis is a serious bacterial infection of the skin. impetigo Impetigo Impetigo is a highly contagious bacterial skin infection, usually caused by Group A streptococcus or Staphylococcus aureus bacteria. jock itch Jock Itch (Tinea Cruris) The term "jock itch" typically describes an itchy rash in a man's groin. molluscum contagiosum Molluscum Contagiosum Molluscum contagiosum is a skin disease caused by a virus that causes clusters of tiny, firm, flesh-colored or pearly bumps. ringworm Ringworm (Tinea) Ringworm, known medically as tinea corporis, is a fungal infection of the skin. shingles Shingles (Herpes Zoster) Shingles, also known as herpes zoster or just zoster, occurs when a virus in nerve cells becomes active again later in life and causes a skin rash. tinea versicolor Tinea Versicolor Tinea versicolor is a common skin infection caused by a slow-growing yeast called Pityrosporum orbiculare. warts Warts Warts are small skin growths caused by the human papilloma virus (HPV), which infects the top layer of skin. body lice Body Lice Body lice are small, parasitic insects found on the human body or on clothing. scabies Scabies Scabies is a mite infestation of the skin. The scabies mite, also known as the human itch or mange mite, causes intense itching, and is contagious. athlete's foot Athlete's Foot (Tinea Pedis) Athlete's foot, also known as tinea pedis, is a common foot infection caused by fungi called dermatophytes. Kaposi's sarcoma Kaposi's Sarcoma Kaposi's sarcoma is a type of cancer caused by the virus human herpes virus 8. The tumors appear as red or purple patches on the skin, mouth, lungs, liver, or gastrointestinal tract. neuroma, Morton's Morton's Neuroma A Morton's neuroma is a benign (noncancerous) swelling along a nerve in the foot that carries sensations from the toes. The reason the nerve starts to swell is unknown. corns and calluses Corn and Callus Corns and calluses are both a thickening of the outer layer of skin. immune thrombocytopenic purpura Immune Thrombocytopenic Purpura ITP is an illness in which unusually low levels of platelets lead to purpura and other forms of abnormal bleeding. hyperkeratosis Hyperkeratosis Hyperkeratosis is a thickening of the outer layer of the skin, which contains a tough, protective protein called keratin. head lice Head Lice Head lice are small, parasitic insects that infest hair on the head. pubic lice Pubic Lice or Crab Lice Pubic lice or crab lice are tiny insects that infest a person's pubic hair, although they also can be found on facial hair, armpit hair and eyelashes. seborrheic dermatitis Seborrheic Dermatitis Seborrheic dermatitis is a form of skin inflammation (dermatitis). wrinkles Sun-Damaged Skin Although most people love the warmth and light of the sun, too much sun exposure can significantly damage human skin. yaws Yaws Yaws is an infectious disease that affects the skin and bones. age spots Age Spots (Liver Spots, Solar Lentigo) Age spots (also called liver spots or solar lentigo) are collections of pigment caused by exposure to the sun. liver spots Age Spots (Liver Spots, Solar Lentigo) Age spots (also called liver spots or solar lentigo) are collections of pigment caused by exposure to the sun. photosensitivity Sun Allergy (Photosensitivity) A sun allergy is an immune system reaction to sunlight, most often, an itchy red rash. herpes zoster Shingles (Herpes Zoster) Shingles, also known as herpes zoster or just zoster, occurs when a virus in nerve cells becomes active again later in life and causes a skin rash. tinea Ringworm (Tinea) Ringworm, known medically as tinea corporis, is a fungal infection of the skin. sun-damaged Sun-Damaged Skin Although most people love the warmth and light of the sun, too much sun exposure can significantly damage human skin. epidermoid cyst Epidermoid Cyst An epidermoid, or epidermal, cyst is a small, movable lump under the skin. It forms when surface skin cells move deeper into the skin and multiply.