The reason he's soaking so much is because he's uncomfortable from the mites. Excessive soaking is one of the first things they do to try and soothe themselves. Once you have the mites eradicated, he should stop soaking himself so often. I agree that the issue with the face looks like an old injury that may have never healed correctly, and therefore left a slight deformity to the area. Good luck with him, he's gorgeous!