BPD is the abbreviation for Borderline Personality Disorder; BP is the abbreviation for Bipolar Disorder.
Kathleen got a tattoo on her thigh 2 episodes ago in "Trials"; when Elliot finds her unconscious in her underwear, there's no tattoo on her thigh.
Elliot wanted Kathleen to get her tattoo removed. She might have gotten it removed.
Elliot wanted Kathleen to get her tattoo removed. She might have gotten it removed.