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.
What are the side effects of niacin? Niacin can cause flushing (redness) of the face and neck within the first two hours of taking a dose. Stomach upset, heartburn, nausea, vomiting, and diarrhea may also occur. At high doses, niacin can increase blood sugar, increase the risk for gout, and cause liver problems.