"Higogen" is not a recognized word in English or any other language. It's possible you might have misspelled a word or it could be a term specific to a certain field or region.

Could you please provide more context or clarify what you mean by "higogen"?

For example:

* Where did you encounter this word? (e.g., a book, website, conversation)

* What was the context of its use?

* What do you think it might refer to?

With more information, I can help you figure out what "higogen" might mean.