erythema

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erythema

(ĕr'əthē`mə), more or less diffuse redness of the skin due to concentration of an abnormally large amount of blood within the small vessels of the skin (hyperemia), as in burns. Erythema nodosum is often associated with systemic diseases such as tuberculosis and rheumatic fever. Tender, bright red, slightly elevated nodules develop along the shins. Erythema multiforme can have a number of causes, including viral and bacterial infection, chronic disease of the visceral organs, or allergic reactions to drugs.

Erythema

 

reddening of the skin caused by the dilatation of blood vessels. Erythema sometimes occurs by reflex action and disappears quickly, for example, when one feels ashamed or angry. With inflammation, the condition lasts longer. It appears as a result of exposure to chemicals and physical factors (friction, heat, cold, ultraviolet radiation) and in some infectious diseases (scarlet fever, measles, erythema infectiosum) and skin diseases (dermatitis). It also occurs as a result of poisoning and disturbances in blood circulation.

erythema

[‚er·ə′thē·mə]
(medicine)
Localized redness of the skin in areas of variable size.
References in periodicals archive ?
states based on cutaneous melanoma in response to atmospheric UV levels; 2) to determine the fraction (UVA, UVB, erythemal UV [UVery], or UV vitamin D [UV-VitD]) that was better associated with cutaneous melanoma; and 3) to analyze the spatial trends of the indicator.
Later research showed that, while days with thick clouds were associated with an 80 percent decrease in erythemal UVR, moderately cloudy days gave evidence of greater UVR than days with clear skies (Bais et al.
UV B is further divided into erythemal (280-300 nm) and nonerythemal (300-315 nm) wavelengths.
The ASCFs account for the differences between wavelength contributions estimated by the erythemal action spectrum and the previtamin D action spectrum toward previ-tamin [D.
Eight white skinned subjects were then whole body irradiated with one personal minimum erythemal dose from sun lamps.
The relationship between chronological age and the erythemal response to ultraviolet B radiation.
The first study set out to determine the cutaneous effects of minimal erythemal amounts of solar-simulated UV radiation, as well as minimal suberythemal doses of UVA.
Speight EL, Farr PM: Erythemal and therapeutic response of psoriasis to PUVA using high-dose UVA.
This relates to one quarter MED (MED is the Minimum Erythemal Dose and is the minimum amount of UVB that produces redness 24 hours after exposure).
19) For example, when fair-skinned adults sunbathe in the summer (one, full-body, minimal erythemal dose of ultraviolet light), for 20 minutes, they deliver about 20,000 units of vitamin D to their systemic circulation within 24 hours.
The initial dose is 70% of the minimal erythemal dose, with dose increments of 40% every other treatment from treatments one to four, dose increments of 30% every other treatment from treatments four to eight, and dose increments of 20% every other treatment thereafter.