Picture 1 â Sun Poisoning Rash. Source â prime health channel. When excessive exposure of the skin to the harmful UV rays of the sun causes an allergic reaction in the form of development of itchy skin rash and the reddening of the skin, one may be said to suffer from Sun Poisoning Rash.
Note that excess niacin intake can cause symptoms similar to an allergic reaction, including skin flushing, stomach redness and warmth, particularly of the face. Your physician may recommend allergy testing to determine if you have an allergy or symptoms of excess intake.
As a vasodilator, niacin increases the flow of blood to the skin dilates blood vessels and creates a sensation of warmth, called a niacin flush or sensation of heat. These are the most common side effects when using Niacin: diarrhea; dry skin; headache; itching; stomach upset; temporary skin redness, tingling or feelings of warmth. Read More My husband was taking a cholesterol med that is high in niacin, a multi vitamin, a B complex and a vitamin fortified cereal..