What is erythema?

Im doing a project about it i need to know what it is and how is someone able to get it.

What is erythema?
Erythema is n large abnormal redness of the skin caused by capillary congestion. It is one of the cardinal signs of inflammation.





It can be caused by infection, massage, electrical treatments, acne medication, allergies, exercise or solar radiation (sunburn), any of which can cause the capillaries to dilate, resulting in redness. Erythema is a common side effect of radiotherapy treatment due to patient exposure to electromagnetic radiation.
Reply:Erythema is a histamine reaction in the skin to an outside irritant, like bacteria or an allergen. It causes the skin to become red and inflamed. Usually seen in a rash, or close to an abrasion that hasn't been properly cared for. Clears right up with an anti-histamine like claritin, benedryl, vistaril.
Reply:It is reddening of the skin and a common but nonspecific sign of skin irritation, injury, or inflammation. It is caused by dilation of superficial blood vessels in the skin. The causative agent is human parvovirus B-19. Transmission is thought to be via respiratory secretions from infected patients; however, maternal-fetal transmission can occur and hemolytic disease of the newborn may result. Some types- ab igne (localized due to heat exposure), annulare (red, ring-shaped rash), chronicum migrans (red rash with a sharply defined border and central clearing and usually appears within 3-32 days after a tick bite), induratum (chronic vasculitis of the skin in young women that leave atrophic scars), infectiosum (moderately contagious disease most commonly seen in school-age children), intertrigo (chafing), marginatum (center of the area fades leaving elevated edges), multiforme (rash usually caused by an immune response to drugs or to an infection), nodosum (red nodular rash on the shins that typically arises in conjunction with another illness), nodosum leprosum (red nodular vasculitic rash which may be a complication of the treatment for leprosy), punctate (occurs in minute points such as scarlet fever rash), toxic (redness resulting toxic agents such as drugs), toxicum neonatorum (benign, self-limited rash marked by firm, yellow-white papules or pustules from 1 to 2 mm in size), and venenatum (caused by contact with a toxic substance).