Warning: This one isn't for the squeamish.

Tyler Seguin, who underwent surgery Friday for a 15 percent tear of his Achilles tendon, showed off the damage on Twitter on Friday afternoon. And, seriously, it's gross.

Related: Seguin injury could stick Stars with daunting 1st-round matchup

The Dallas Stars forward is expected to be out of action for three-to-four weeks, and based on the evidence - the gross evidence - below, the timeline makes sense.

You were warned.

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