Really unimportant question but

I'm playing a tweaked version of the amazon challenge and I made a society of cat/fox people. I made it a rule that if a sim grows into a teen wearing a pair of cat/fox ears she would have to change her natural hair colour to suit the ears. If she didn't grow up with ears she would put on a pair of ears that match her natural colour. My sim's child grew up wearing yellow ears but she had red hair so I changed it. While I was in CAS I noticed she had a spot on her face.

http://i.imgur.com/zZ33riY.png

I thought it might have been the custom skin so I took it off. I took her makeup off too even though she was only wearing eyeliner. Her spot is still there. Where did it come from? I know it really doesn't matter because it's just a spot but I've never had a sim with it before and she doesn't have any skin details on to give her the spot.

http://i.imgur.com/84kflV5.jpg