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.
However, if an excessive amount of niacin is ingested, this leads to a rapid heartbeat or pulse rate. This is one of the warning symptoms that you have too much niacin in your system. Niacin Side Effect #2: Flushed Skin. A healthy glow is one thing, but an awkward, flushed appearance is quite another. Another side effect of niacin is that the skin can become flushed.