Whether it is from temporary or lasting redness, rosacea or couperosis, some types of sensitive skin easily overreact in certain circumstances. Heat and UV radiation are two factors that promote vasodilation.
When exposed to the sun, small blood vessels that cause redness dilate and become more visible, especially on people with fair, thin skin who are most prone to redness. People with these skin types need to protect themselves using creams designed specifically to prevent aggravating redness.