hello everyone. nice 2 meet and know u all

i'am newbie in frog world. i just start keeping pacman frog as pets for 3 weeks. although i keep another reptile like snakes and gecko.
today my friend give me his pac man frog pet to me considering he don't want 2 take care of it anymore, unfortunately it comes with problems and disseased that i don't know what it is.

in its back there is a healed up wound (there is a big soares before but it blow up now,actually i'am not sure its healed up or not)



and his body posture stay like this all the time, its diffrent with my other pacman frog (if you notice there is unproportional bload in its body)


also its butt opening seems wierd, and big


its not eating but its still moving sometimes, its eyes looks ok and it not seem to be weak animal.

please help us to identified the problem and sickness, (i'am living in indonesia) in here i can't really hoping to the vets(no good,they don't really understand about reptiles & amphibians) so i might treat it myself.
my friend put it in the tank with moist coir (cocopeat) as a substarte then the soares comes out, now i put them in the small pet home with only water in the seperate room from my other animal

thanks for the attention and help