Is there something wrong with my turtles shell? Pics Provided?

Question

Okay, I have had these turtles for about a month now, and one of them has grown a lot bigger than the other, I'm not sure if the texture on the shell now is because the shell is growing or not, or maybe its some type of fungus I'm not totally sure.

I have uploaded two photos to photobucket and here are the links:

http://i231.photobucket.com/albums/ee101/nathan6590/Image022.jpg

http://i231.photobucket.com/albums/ee101/nathan6590/Image021.jpg

Both my turtles also have white dots on either side of their heads. I have a heater, big tank, UV Light and all the things the pet store said, there is an area for them to bask but they never seem to bask they are always under water unless i put food on the rock.

Is it healthy for me to take them outside so they can bask? If so how long should I keep them out there for?

Answer 1

I used Hydrogen Peroxide to treat my turtles shell for white spots, I deluded it with water and applied with cotton, the shell now has turned white almost all around.  Is that ok or am I killing my turtle?