opportunistic infection - any infection caused by a microorganism that does not normally cause disease in humans; occurs in persons with abnormally functioning immune systems (as AIDS patients or transplant patients receiving immunosuppressive drugs)
Why your 'flushing' could be a red alert to see your doctor. It is a normal body response that may occur when we are embarrassed, angry, excited, or experiencing other strong emotions. But 'flushing' - when the face, ears, neck and, occasionally, upper chest, take on a red colour, accompanied by a hot feeling - can also be a sign of a more serious underlying condition.
Being overly warm. Warmth causes blood vessels to dilate, which causes more blood to near the surface of the skin. When the body is warm, more blood is able to near the surface of the skin making the skin feel warm and look red. A hot environment is a common cause of blushing, flushing, and having skin turn red. Persistently elevated stress (stress-response hyperstimulation) Just as an active stress response can cause a blushing, flushing, turning red effect, so can persistently elevated stress.