Hi,
Sorry your frog has what is likely an infection? Poor baby
In the 1st photo posted .....the area under the light green coloration looks swollen; but not in photo 2 and 3.
Were these photos taken taken on different days?
Could this be the result of a puncture?
Do you see anything on the light green spot that looks like a puncture that closed up? It would be very dark and small.

He needs a herp vet.
If you don't have a herp vet near you ( that will treat frogs and is experienced with frogs) you can contact Dr Frye:
This can be done via email. Attach these three photos ( especially the 1st photo).

Payment for medications is made via tele with a credit card or paypal and then mailed.meantime

It all goes very smoothly...he is great.
He might be off on Wednesday....but I do recall him responding to me in the past on a day off....even on a Sunday.

"You can pay by PayPal at dr.frye.vetatmilan@gmail.com , or by calling my office at 734-439-2273 and paying via credit card over the phone "

http://www.frogforum.net/tree-frogs/...-prepared.html

http://www.frogforum.net/tree-frogs/...-supplies.html

You will want to move along as there will be the wait because of shipping. He may be able to tell you what to do in the
meantime.

When emailing him give him a little background about the frog and, if possible, a weight ( use a food scale/metric)
If a weight is not possible, measure him ....snout to vent.

Additional information should include :
is the area under the light green soft or firm
how long has he been like this
the frog's approx age
wild or captive bred --- if known
when and where ( from whom) did you purchase the frog
is he eating
have you found poop
does he have diarrhea
is he lethargic
is he spending time in the water dish

Knowing if the frog is wild caught or captive bred is important...If you could determine this it would be helpful for Dr Frye to this information.

Best of luck- keep us posted
Lynn