Redness of the skin caused by swelling of capillaries is:

The redness of the skin caused by blood vessels is called Erythema. Erythema is also the redness of the skin caused by increased blood flow in capillaries. Skin injury, Skin infection or Skin inflammation are an example of cases that the erythema may occur. it is also defined as abnormal redness on the surface of the skin usually caused by skin irritation or congestion of the capillaries. The redness on the surface of the skin of the infected person is an example of erythema. There are many causes of skin redness that the people can get example are irritation, sunburn, skin rashes caused by allergic reaction, and much more. 

Mg is used to measure mass