I use postwork to get rid of Bryce's pregnant tree bumps. If you use Photoshop, you can use the "liquify" feature under Filters and nudge the bumps inward. You have to be aware of what the background is and avoid warping it. Working on a duplicate layer you can erase to top layer to get the background back. PSP might have some warping tool, not sure. You can also clone the bumps out