What the heck???

So hi everyone. It's been a while since I have got to post, and I'm sorry about that. 

So, I need your help.  What do you think about the above photo??? What the heck?  Dust? Spot on camera?  I don't think so.  I checked the camera...no spot.  And dust? hhhuuummm

We gave a friend of mine a shower at work, and we took pictures before the shower, and this is what we caught.  So, what do you think? I would love to hear your comments.