While not all non-blanchable rashes are an emergency, “it’s never a bad thing to go get it figured out,” said Friedman, adding that individuals should watch out for any other symptoms.

This is called a blanchable rash. Basically, this tells us that there are dilated blood vessels full of blood at the surface of the skin, giving it the red color.

Can you identify these rashes? Internal medicine and rheumatology specialist Siobhan Deshauer, MD, is back for part 2 of "What Your Skin Says About Your Health," where she describes several skin ...

The blanching skin test is used to determine if a rash or discoloration disappears when pressure is applied, which may be a sign of another illness.