Hi welcome to the health care magic Kindly mention your friend taking which drug.. Some drugs can lead vasodilation and so face can turn red... Excess heat or sunlight exposure also can lead face red... If diarrhea like symptom present than thyroid should be ruled out.. Avoid taking alcohols... Avoid stress as panic attack can lead flushing Second if papules like lesion develops and if it is in centre of face than it could be rosacea Avoid direct sunlight exposure Take care Consult physician or dermatologist for examination