discoloration on some scales....something to worry about?

so my bp has some discoloration to some scales...they are whitish. She is really active ...even though I have two hides. Not shy at all and seems to be very healthy. heres a pic. They are small and on the top head and top kneck (that really white shade is just a blur haha)

http://i687.photobucket.com/albums/v...1/PICT0086.jpg

http://i687.photobucket.com/albums/v...PICT0086-1.jpg

When was the last time she shed? That could cause possible scales to be left over if they were not rubbed off and shed all the way.

about a 3 weeks ago. I tried rubbing them off with a damp paper towel but they didn't come off.