I've read some of the suggestions online but, I am still not sure!
The turtle is a baby and was just bought yesterday. I just place it in a medium bowl with sand, drinking water, and some food pellets. I don't have any UVlight or a lamp, butI just put him in the sun during the day.
Is this fungus? What should I do to cure that?

And no the spot doesn't disappear under the water.
Will just drying by the sunlight heal my turtle?
Please help!!