She posted a close-up photo of her face and began with a trigger warning for body dysmorphic disorder.
She wrote, "I punished myself for not looking like my mom, after being told I was BW twin since birth - I resented the resemblance as I believed wholly my “masculine” face was the sole reason for my unlovability - FALSE! I was/am inherently valuable and worthy, at any life stage, at any size, with anyhair do! (As are you)."
She added, "Be mindful of the special and impressionable minds around you and their access to social media and potential triggering imagery or the indicators that hyper-focusing on ones appearance goes deeper then just wanting to feel good in their own skin. "We all want to feel good, and confident but when it creeps into a deeper, spookier place where it begins to devour your essence bit by bit, ask for help. Do not feel ashamed, this is not a “stupid, vain issue” this is a genuine psychological pain and I see you so clearly and witness the validity in your struggle."
Willis concluded the post with tips on how others who have faced challenges from body dysmorphic disorder can care for themselves, including taking a walk or writing.
According to Mayo Clinic, "Body dysmorphic disorder is a mental health disorder in which you can't stop thinking about one or more perceived defects or flaws in your appearance — a flaw that appears minor or can't be seen by others."
The condition can affect anyone, no matter how they look. It is a type of anxiety disorder, which is a very common mental health condition.
Demi Moore shares three daughters with ex-husband Bruce Willis: Rumer, 32, Scout, 29, and Tallulah, 27. The couple were married from 1987 until 2000.
Each of their daughters has opted for a career in the spotlight - Rumer as an actress and singer, Scout as an actress and Tallulah as an actress and model.