Lump after root canal is generally associated with failed root canal treatment. If you wish to save the tooth, redo root canal is a viable option. There are U.S. trained dentists practising in beijing and shanhei.They may help you.
1. A lump on the gum almost always means you have an infected tooth, the lump is where the bacteria has pushed out of the bone and is draining. The dentist should take an xray to determine which tooth is the source.
2. Many general dentists do not like to take out wisdom teeth. You will need to find an oral surgeon for those.
Good luck in China