I stayed at a friend's place. He usually doesn't keep his room clean. The next day i got these reddish marks & after that they started occurring on the whole body. I thought its due to extreme weather but I guess I was wrong. I consulted a general physician, he prescribed some medicines but it seems they are not effective. What is the problem i am facing & what shall i do now? Is there any ayurvedic treatment for this? In the image , these reddish marks are near neck.