Anyone know what may cause a small lump on a whites tree frog? It's soft to the touch, it developed just the other day. When the frog is brown, the lump is always green. The frog is eating normally, and doesn't seem to be behaving oddly.

Name:  unnamed1.jpg
Views: 3007
Size:  98.5 KBName:  unnamed2.jpg
Views: 2936
Size:  53.6 KB