Well, I am not an expert like most of these people, I have a whites tree frog as I will attach a picture. I believe this is due to not putting the dechlorinater in the water to mist and for him to soak in. The Chlorine in the water will react with the frogs skin due to frogs absorbing through their skin. This chemical is harmful to the frog witch will cause this blotchy skin pigment you see. If you don't have money to buy the treatment for the water, A easy non expencive way to do it is to, Buy a flat of bottled water when ever you can. Or you can boil water. Just keep it in a container with a lid. Hope this helps.

This is my whites tree frog Castiel. And other people on this forum do believe he was wildy caught as well, But I bought him from the reptile expo.Name:  Castiel (2).jpg
Views: 2585
Size:  59.7 KBName:  Castie.jpg
Views: 2741
Size:  54.0 KBName:  Cas on cylus's tank.jpg
Views: 3376
Size:  83.6 KB