Hi there I noticed this mark yesterday can someone tell me what it is I have no vet in my area qualified in this thanks in advance

tank is is clean and other frog is fine it's just my boy looks like he also has two dark spots down the leg area to small to get photo of any help would be great what can I do to help him please I don't want to loose my baby
he is fine within himself eating n normal activities
My enclosure has waterfall heaps of foliage which is not different since got them a year ago also have a 5watt UVB lamp on for 8hrs a day and humidity in tank hovers from 80-90 percent I have a feeling he may have caught himself on a piece of driftwood which has now been removed and replaced with a bigger bit thanks heaps

For any help please and thank you
what can I do as a owner to help him thanks