OP,
Your concern itself is indicative of an endearing quality, that of someone being thoughtful and, though you may not have or did just meet, caring of them and their mental well being. As Cassie mentioned above, "these signs may not be related at all to this industry." The truth is, until they open up and share with you one can only assume the nature of their struggles. Also as Cassie mentioned, "Should you bring it up and get involved?" Her reply of 'No' is my sentiment as well, in fact 'never' should this be done. If or when this ever occurs, let them freely share with you. As much as one may be curious pointing it out to them and/or asking questions, as most can imagine, is not a suggested approach as this can only help you but have a negative effect/impact on them.
Understanding the signs or stages of someone who is or has done this can help you understand where an individual currently stands in regards to their current mental health.
-Do the scars seem recent or of years past. Fresh scars would concern me. For example if the cuts were not completely healed and/or the scar tissue itself is still red or pink in color as this would be a sign of something fairly recent. Scar tissue can take one and a half to two years before appearing white, so scar tissue with a white appearance would likely be a sign of troubles past.
-Does the person seem comfortable in their own skin and not trying to hide their scars or are they showing behavioral signs of not feeling comfortable around someone new and in any way trying to hide these scars. Many people, most in fact, who have dealt with any type of mental struggle overcome them and live a normal, healthy and mentally stable life.
From my experience when the time is right for them they, man or woman, will more than likely open up and share their story with you one day. In real life, just like in this industry, we don't all come from pleasant story book type upbringings.