Why is the skin so red in RSS?
Corticosteroids have the ability to close or constrict blood vessels in the skin momentarily. This causes a blanching (whitening) effect in the skin, but the vessels have a “job to do” so they dilate again causing redness. With this yo-yo effect being repeated endlessly the vessels eventually remain dilated to perform their task. The redness can last days to weeks before normalcy returns and the process repeats itself again.