i have a small pac man frog, about 1 1/2 inches long, and next to one of his front feet there is a dark purple spot on his underbelly by the foot, i dont knwo is this is a cut or not because a few days ago i put a rock in his terrarium and it had sharp edges, and i saw him jump on it, and then i realised it wasnt a safe thign do do, so i took it out, he is functioning healthy and eating, but i dotn knwo if the dark purple spot on his belly is a cut or not, and if it is, can he die from it?