Make absolute sure you talk to your psychiatrist or therapist. They may not can stop you from doing it, but you never know what information you can improve from.
Call 988 for help if need to and go from there
If you are self harming then you need to get some help. Are you seeing a therapist?
I Have A Question, What Is The Risk If There Is One In Developing A Personal Relationship With Someone Else Who Has Bipolar Disorder?
If You Use Twizzers And Drag It Across Your Skin Is That Self Harm?