Definitions for sycosissaɪˈkoʊ sɪs
Random House Webster's College Dictionary
an inflammatory disease of the hair follicles, characterized by a pustular eruption.
Origin of sycosis:
1570–80; < Gk sykōsis ulcer resembling a fig
a pustular eruption upon the scalp, or the beared part of the face, whether due to ringworm, acne, or impetigo