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.
Flush Symptoms. When higher doses of niacin are prescribed, side effects may occur. The most uncomfortable side effect may be the flush, a reaction that can cause the skin to burn or get warm, red and itchy.A niacin flush can resemble a sunburn and may affect the head, face, neck, chest, shoulders and back.hen higher doses of niacin are prescribed, side effects may occur. The most uncomfortable side effect may be the flush, a reaction that can cause the skin to burn or get warm, red and itchy.