What's the symbolism in my dream?

I dreamt that I opened my front door at night, and outside there was a pile of rotting bones on the front lawn. There’s hundreds of flies hovering the pile. I then see a huge mosquito, it was going to strike me. But, I was quick enough to escape and close the door, with the tip of it’s needle nose through the peephole. What does the bones, flies, and mosquito mean?