What Causes Bruises On The Body?

This morning i woke up and when i looked in the mirror i had a bruise on my lower left side of my body. Its large. I went to work and i noticed that it is getting bigger and i have one on my right side appearing also. Just in the matter of one day. Im a little overweight and i have become accustomed to wearing girdles and i don't know if that has anything to do with it. Im getting worried