Callus – Definition, Removal and Treatment

Definition of Callus Callus is an accumulation of keratocytes that form a thickened area of skin in response to repeated friction or pressure, typically at the site of repeated blistering. A callus may be a different color than the surrounding skin, often grayish or yellowish. Calluses are most likely to develop on the palms, fingers, fingertips, heels, […]

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Erythema Nodosum – Symptoms and Treatment

Definition of Erythema Nodosum Erythema Nodosum – The eruption of red nodules along the top surfaces of the lower legs (shins). Erythema nodosum is nearly always a symptom of an underlying condition, often a streptococcal infection, and represents inflammation of the fatty tissue at the foundation of the skin. Other symptoms include fever, pain and swelling in the joints, and generalized discomfort […]

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Lesion – Definition and Types

Definition of Lesion Lesion is a generalized term for any abnormal growth – can result from injury, disease, or surgery. Some lesions are malignant (cancerous) though most lesions are benign (noncancerous). Numerous types of lesions affect the skin. Their characteristics help define and diagnose disorders and conditions of the skin as well as systemic disorders that manifest […]

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Plaque, Skin – Definition, Symptoms and Treatment

Definition of Plaque (skin) Plaque (skin) – raised, hardened, scaly lesions that form on the skin. Plaques characterize numerous dermatologic conditions. They may itch, hurt, or flake and may occur in small clusters or cover large areas of skin. Treatment for skin plaques targets the underlying conditions and includes measures to moisturize or soften the skin to help […]

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Toxic Epidermal Necrolysis – Stevens Johnsons Syndrome

Definition of Toxic Epidermal Necrolysis Toxic Epidermal Necrolysis is a life-threatening inflammatory condition affecting the skin and underlying connective tissues, also called Stevens-Johnson syndrome. Toxic epidermal necrolysis usually results as an adverse drug reaction though may occur as a complication of infection or cancer. Doctors believe toxic epidermal necrolysis develops when an external event triggers the mechanism for programmed cell death […]

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Carbuncle – Definition and Treatment

Definition of Carbuncle Carbuncle – Clusters of infected hair follicles (furuncles) that often form an abscess.Carbuncles are most common on the back of the neck and shoulders, though may form at other locations where furuncles tend to occur. Carbuncles are painful and often result in fever and general malaise (not feeling well). The infection is deep within the […]

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Erythrasma – Definition and Treatment

Definition of Erythrasma Erythrasma is a chronic bacterial infection of the epidermis (outer layer of the skin) that produces scaly, brownish red patches that often itch. The patches may occur anywhere on the body though are most common in skin folds and moist areas such as the underarm (axilla) and groin. When viewed under ultraviolet light, the areas of […]

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Lichen Planus – Definition, Treatment and Symptoms

Definition of Lichen Planus Lichen Planus – a common condition affecting the skin that appears as small, shiny, reddish purple (violaceous) bumps that itch, sometimes intensely. The bumps grow together in a scalelike pattern that resembles tree lichen. Lichen planus nearly always occurs in adults. Symptoms and Diagnostic Path Lichen planus typically erupts on the inner surfaces of the […]

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Prurigo Nodularis – Definition and Treatment

Definition of Prurigo Nodularis Prurigo is a chronic condition in which lesions, typically papules or nodules, that itch intensely erupt on the skin. The lesions may occur anywhere on the body, though typically form in locations that allow scratching. Because the cause of prurigo, also called prurigo nodularis, remains unknown, dermatologists do not know whether the lesions develop in […]

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Urticaria – Acute/Chronic – Definition and Treatment

Definition of Urticaria Urticaria is the clinical term for hives, an outbreak of wheals on the skin’s surface. Acute urticaria, which comes on suddenly, typically signals a hypersensitivity reaction. The wheals contain fluid the immune response draws from the cells of the skin. They itch, often intensely (pruritus), and may appear and recede in various locations on […]

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