What Causes Black Clolour On The Tip Of Penis?

recently undwewent a two level cervical fusion,and bonw as harvested from my hip. This is the tird time I have been throgh this type of suegeru so pretty familiar with the process. My right testicle started causing me pain a hour or so ago and upon examining myself my pubic area and all pbut the very tip of my penis is black or deep purple in color, and the right side of my scrotum is tunring balck as well. It should also be noted that the bone was harvested from my right hip as well. Tried pubmed but no answrs so far. Signed scarred as hell