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.
Different people react differently to the same allergens. Some people may just have an uncomfortable rash, while others may go into anaphylactic shock. In any case, signs and symptoms of a food allergy usually develop within a few minutes to an hour after having ingested the food. The most common signs and symptoms of a true food allergy include: 1  tingling in the mouth; 2  itching or eczema; 3  swelling, especially on the lips, face, throat, and neck; 4  wheezing, nasal congestion, and a general difficulty in breathing; 5  abdominal pain, nausea, and vomiting. 6  dizziness, light-headedness, and fainting.