Hi, I have allergy due to which suddenly red patches appear on my hands, legs, neck or anywhere. I also start sneezing and start having running nose. Then I take levo cetrazine (okacet L-5mg) and then it subsides gradually. I usually take it once in 3,4days. I've been taking it since 5,6 years. Haven't really been able to analyze why dies the allergy occur, because there is no specific thing which causes it. Sometimes I belive it is sudden weather change, or intake of sugary food items but not very sure. It started when I went to mysore in late 2014. Earlier small small mosquito bite like rashes used to appear, but now it's just red patch. I've had done all blood tests, nothing appeared apart from vit D deficiency. I have great haemoglobin and I'm also completely fit.