Lupus; specifically lupus of the external genital organs.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
There seems to be no etymology available specifically for the word "esthiomenus". It is possible that it might be a misspelling or a rare word that has limited information regarding its origin. Additionally, it may be related to a specific field or context, which can further affect its etymological information.