Notepad++ does not come out of the box with a syntax highlighter for Erlang, but it does come with the support for creating a User Defined Language. Here is a syntax highlighter that I found to be almost what I needed. I use the Obsidian style and so I needed to make a couple of changes.
Here is my syntax highlighter for Erlang using the Obsidian style. Import it into Notepad++ by going to View > User Defined Dialogue and clicking on Import.
