I have been having petechiae since last year. I have them on my legs. I have had a cbc drawn up twice with normal blood work. however, Im concerned and cant really put my mind to ease because I wouldn t be having these red dots if something wasn t wrong. Can you have petechiae and be completely healthy?? or is there something else going on that should be investigated more. They do not last for more than two weeks and go away as quickly. This petechiae appears only during cold weather. I m thinking that the weather is the cause of my petechiae on the legs.