Creepy faces caught on camera

As Halloween approaches I decided to re-post this picture I took in 2007 of my great niece.  She was just learning to walk and still crawling up the steps of my parents home.  I thought it was cute so I shot this of her backside and immediately saw this face on the screen of my digital camera.  It is very CREEPY!~   I also see one on the back of her right arm.  

Any explanations?  The ONLY photo alteration I have done is to adjust the contrast so you can see the details even better.  I'd love to hear your comments.