ok it seems like the gar is doing fine in terms of eating, but until we determine if the spot is actual damage or just some developmental anomaly, i would keep temperature bumped up at least at 78F...72F is actually on the lower end for YOY gars and growth - at least with gators. higher temp will increase growth, increase metabolism and immune response, and give it a better chance of overcoming the issue.
please keep us posted, but it looks like the gar should be ok--
--solomon
thanks for ur advice it is cured. i think it's skin was torn in transport or something. now it has grown back. this is the first gar for me and i'm somewhat nervous.
the picture follows
now it's size is 6inches and its more rounded