CCL4 and keloid: Postconditioning with HBO is commonly used to improve wound healing after flap transfer in plastic surgery.[35] Recently, there has been research regarding the use of HBO as a therapy.[36] Our study first assessed the expression levels of IL-12p40, MIP-1β, PDGF-BB, and IL-1Ra in keloid tissues in comparison with normal tissues, and it concluded that the expression of IL-12p40, MIP-1β, PDGF-BB, and IL-1Ra and inflammatory responses may be the causes of a keloid.