I am not sure about the marks, looks to be an injury, like he was trying to push his head through something. Someone else will have to pop in with treatment ideas, I do not have experience there.
How big is his tank? It could just be the angle of the photos, but it looks too small for a whites tree frog. There are also no branches in there for him to perch on. Here is a care sheet to help you - Frog Forum - White's Tree Frog Care - Litoria caerulea





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Poor guy, it's hard to leave them in the care of someone else.
