Thanks for writing in.
The lumps in your daughter's case look like they are haematoma
. This usually occur after some injury
. Given the fact that your daughter is anorexic, her tendency of having such a condition increase as the subcutaneous fat (fat under the skin) is decreased in anorexics. This makes them more susceptible to injury.
This lump will resolve on its own in a few weeks. There is nothing that you need to do. Hot fomentation will help it resolve faster. Please seek a physician's help for your daughter anorexia
. This can have disastrous consequences in the long term.