Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concern.... As per your complain as you have got the palatal expander removed and there were overgrown gums over it so while removing it there must be laceration or injury to the gums in the attempt to remove the palatal expander and as the soft tissues must have got inflammed as a result of injury there is pain and bruised feeling in that area.. You need not to worry about it as the healing will take place soon as the oral cavity has a profuse blood supply and any injury heals fast.. For pain you can apply a numbing gel like Lignocaine Gel over the sore area for relief from pain especially during meals.. Apply Steroid based oral paste over the sore area to reduce inflammation.. You can also take OTC painkiller like Ibuprofen [advil or motrin] or Paracetamol[Tylenol] for relief.. Sucking on ice pops can also help.. Avoid very hot and spicy foods as it will cause irritation and add up to discomfort.. Maintain a good oral hygeine to prevent infections.. Hope this information helps.. If you find the answer helpful please give me a Five Star Review and click on found the answer helpful as a token of appreciation.. Thanks and regards.. Dr.Honey Nandwani Arora..