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The most distinctive features of the EM rash are the speed and extent to which it expands, respectively 2–3 cm per day and up to a diameter of 5–70 cm (50% attain more than 16 cm). [ 3 ] [ 10 ] [ 4 ] The rash is usually circular or oval, red or bluish, and may have an elevated or darker center.
Lyme disease, also known as Lyme borreliosis, is a tick-borne disease caused by species of Borrelia bacteria, transmitted by blood-feeding ticks in the genus Ixodes. [4] [9] [10] The most common sign of infection is an expanding red rash, known as erythema migrans (EM), which appears at the site of the tick bite about a week afterwards. [1]
Erythema ab igne (Latin for 'redness from fire') EAI, also known as hot water bottle rash, [2] is a skin condition caused by long-term exposure to heat (infrared radiation). [3] Prolonged thermal radiation exposure to the skin can lead to the development of reticulated erythema , hyperpigmentation , scaling, and telangiectasias in the affected ...
The rate of SLE varies between countries, ethnicity, and sex, and changes over time. [136] In the United States, one estimate of the rate of SLE is 53 per 100,000; [136] another estimate places the total affected population at 322,000 to over 1 million (98 to over 305 per 100,000). [142] In Northern Europe the rate is about 40 per 100,000 ...
The mean of all the studies combined results in an EM estimation incidence of 4.7/100,000 with a mean of 1 : 3.7 of the male to female ratio, respectively. [44] [45] In 1997 there was a study conducted in Norway that estimated that the annual incidence of 2/100,000, with a 1 : 2.4 male to female ratio in this study population, respectively. [46]
After 1–3 weeks burn symptoms appear; erythema, increased skin pigmentation (dark colored patches and raised areas), followed by epilation and skin lesions. Erythema occurs after 5–15 Gy, dry desquamation after 17 Gy, and bullous epidermitis after 72 Gy. [15] Chronic radiation keratosis may develop after higher doses. Primary erythema ...
The redness starts to fade and it gradually becomes softer and smaller until it disappears. Each nodule usually heals completely without scarring over the course of about two weeks. [3] [4] Joint pain and inflammation sometimes continue for several weeks or months after the nodules appear. [5] Less common variants of erythema nodosum include:
Erythema multiforme (EM) is a skin condition that appears with red patches evolving into target lesions, typically on both hands. [2] [3]It is a type of erythema possibly mediated by deposition of immune complexes (mostly IgM-bound complexes) in the superficial microvasculature of the skin and oral mucous membrane that usually follows an infection or drug exposure.