Hi ! I am healthy male. I got crackling (it's like buzzing) in my left lower lung (I am not sure it's my lung but it's in that area, and it's always in the same spot) especially when I am slouching or crouching. I don't have any other symptoms. It comes and goes . I didn't have it when i am standing. It can't be heard outside. Also I am allergic to dust mites. I'm away from home . So I can't see my doctor right now.Is it something serious ?