Redness of the skin or mucous membranes, caused by hyperemia of superficial capillaries.
11. Erythema nodosum is a condition that causes red rounded lumps (nodules) to form just below the skin surface, most commonly on the shins. In most people, no specific cause or trigger can be found. But in some people a trigger (commonly a streptococcal infection or sarcoidosis) can be identified. Erythema nodosum is a type of panniculitis. Panniculitis occurs when there is inflammation of the layer of fat lying underneath the skin. The inflammation causes red rounded lumps (nodules) to form just below the skin surface, which are tender. Erythema (from the Greek erythros, meaning red) is redness of the skin or mucous membranes, caused by hyperemia of superficial capillaries. It occurs with any skin injury, infection, or inflammation. Examples of erythema not associated with pathology include nervous blushes.  Erythema is a skin condition characterized by redness or rash. There are many types of erythema, including photosensitivity, erythema multiforme, and erythema nodusum. Photosensitivity is caused by a reaction to sunlight and tends to occur when something, such as an infection or a medication, increases your sensitivity to ultraviolet radiation. Erythema multiforme is characterized by raised spots or other lesions on the skin. It is usually caused by a reaction to medications, infections (especially herpes simplex virus), or illness. Erythema nodosum (EN) is an inflammatory condition characterised by inflammation of the fat cells under the skin, resulting in tender red nodules or lumps that are usually seen on both shins. It can be caused by a variety of conditions, and typically resolves spontaneously within 3–6 weeks.  Erythema nodosum is a type of skin inflammation that is located in a part of the fatty layer of skin. Erythema nodosum results in reddish, painful, tender lumps most commonly located in the front of the legs below the knees. The tender lumps, or nodules, of erythema nodosum range in size from a dime to a quarter. Chronic erythema nodosum is a condition in which lesions pop up elsewhere, for a period of weeks to months. However, chronic erythema nodosum that may last for years is another pattern. Chronic erythema nodosum, with intermittent recurrences, can occur with or without an underlying disease present. Erythema nodosum is a type of skin inflammation that is located in a certain portion of the fatty layer of skin. Erythema nodosum (also called EN) results in reddish, painful, tender lumps most commonly located in the front of the legs below the knees. The tender lumps, or nodules, of erythema nodosum range in size from one to five centimeters. The nodular swelling is caused by a inflammation in the fatty layer of skin. Erythema nodosum can be self-limited and resolve on its own in three to six weeks. Erythema nodosum is a type of panniculitis that affects subcutaneous fat in the skin, usually first evident as an outcropping of erythematous nodules that are highly sensitive to touch. 1 Most nodules are located symmetrically on the ventral aspect of the lower extremities. Generally, it is idiopathic, although the most common identifiable cause is streptococcal pharyngitis. Erythema nodosum may be the first sign of a systemic disease such as tuberculosis, bacterial or deep fungal infection, sarcoidosis, inflammatory bowel disease, or cancer. Erythema nodosum is a painful inflammation of the connective tissues beneath the skin’s surface. It is characterized by lumps or nodules beneath the skin that are about an inch across, and are firm, red and warm to the touch.  Erythema nodosum is a condition that causes red rounded lumps (nodules) to form just below the skin surface, most commonly on the shins. In most people, no specific cause or trigger can be found. Erythema nodosum is a type of panniculitis. Panniculitis occurs when there is inflammation of the layer of fat lying underneath the skin. The inflammation causes red rounded lumps (nodules) to form just below the skin surface, which are tender. Erythema nodosum, a painful disorder of the subcutaneous fat, is the most common type of panniculitis. Generally, it is idiopathic, although the most common identifiable cause is streptococcal pharyngitis. Erythema nodosum may be the first sign of a systemic disease such as tuberculosis, bacterial or deep fungal infection, sarcoidosis, inflammatory bowel disease, or cancer.
http://patient.info/health/erythema-nodosum-leaflet https://en.wikipedia.org/wiki/Erythema http://umm.edu/health/medical/altmed/condition/erythema https://en.wikipedia.org/wiki/Erythema_nodosum http://www.webmd.com/skin-problems-and-treatments/erythema-nodosum http://www.medicinenet.com/erythema_nodosum/article.htm http://www.aafp.org/afp/2007/0301/p695.html http://www.healthgrades.com/conditions/erythema-nodosum http://patient.info/health/erythema-nodosum-leaflet http://www.aafp.org/afp/2007/0301/p695.html
what is erythema and what causes it