Sentence:  It invades lymphatics, is carried to the inguinal lymph nodes, where multiple abscesses, buboes, or "<WSD>blue balls</WSD>" appear. A brawny edema of the labia, with deeply penetrating destructive ulcers may occur in the late stages. 
Meaning of the word marked with <WSD> tags:  Buboes (in a person of any sex) caused by a sexually transmitted infection; the infection that causes them.