My wife has the same issue.  For those who don't know, petechiae are dots of blood which appear under the skin; they often appear with purpura, which are larger areas or patches of blood under the skin, rather like a bruise. They appear suddenly, then fade over time. Usually, the dot or patch is well beneath the surface of the skin, but just occasionally it  might bleed. The dots and patches can appear anywhere. 

My wife has had a couple of blood tests but everything seems ok. It just appears to be something that has started as she's got older. It was startling at first, but our GP has reassured us that there's nothing wrong. 

As a general rule, we advise people not to search for their symptoms on Google.  The problem is that if you follow any chain of symptoms far enough, you will always reach cancer or some other dire condition.  

I think since your patches have reappeared you should revisit the doctor, who may want to repeat the blood work. 

Hello, I was wondering if you new how long roughly it takes for it to fade ? 
I've had this on my left breast. I think it's from me sratching too hard, but it's been there for 4 weeks now. It's very small but is this normal or should it have disappeared by now ? 
thank you. 

Hello, I was wondering if you new how long roughly it takes for it to fade ? 
I've had this on my left breast. I think it's from me sratching too hard, but it's been there for 4 weeks now. It's very small but is this normal or should it have disappeared by now ? 
thank you.