Fire Sprinkler Covers Was There A Fire In My Apartment?

Was there a fire in my apartment? - fire sprinkler covers

Yesterday my son was at the door of his color (he was only 4). So I had to rub off. Washing up, I realized that I had taken one or two coats of paint. I noticed it because he brown-black markings on the bottom of the door for me has been the hallmark of the fire damage. This must explain why there are no shades of the rest of the house and why the irrigation head is different (which is different is the white spot for the spray), the others do not. Is this evidence of an indoor fire?