The present invention relates to, inter alia, methods of treatment and combinations of (R)-2-(7-(4-cyclopentyl-3-(triflu-oromethyl)benzyloxy)-1,2,3,4-tetrahydrocyclopenta[b]indol-3-yl)acetic acid (Compound 1) useful for the treatment of extra-intestinal manifestations (EIM) in an individual with inflammatory bowel disease (BBD) and for the treatment of pyoderma gangrenosum (PG). In some embodiments, the methods further comprise administering Compound 1, or a harmaceutically salt, solvate, or hydrate thereof, in combination with a therapeutically effective amount of a compound selected from the group consisting of: a corticosteroid, a 5-ammosalicylic acid derivative, and a TNF-alpha inhibitor； or a corticosteroid, an immunosuppressant, a biologic, an anti-inflammatory agent, and an antibiotic.
