1. Contact them: It is very important to communicate with them and express their concern and support. Don't ignore their plight or try to cover up their pain. Establish contact with them, listen to their thoughts and feelings, and provide help and support as much as possible.
2. Provide support: Let them know that they are not alone and that someone cares about them. You can try to share your experience with them, give them comfort and support, or ask them to seek professional help. Sometimes, it may just be a simple listener, giving them a chance to express their feelings and emotions.
3. Encourage seeking professional help: Many people's tendency to self-harm may stem from some psychological or emotional problems, such as depression and anxiety. Encouraging them to seek professional help, such as psychological counselors or psychologists, can help them better understand and deal with their own problems. At the same time, it can also provide some relevant resources and information to help them find the right way to help.
Remember, for those who tend to hurt themselves, we can't simply solve their problems through conversation or comfort. It is very important to seek professional help, and as classmates and friends, we can provide them with support and encouragement to help them find the right way to deal with their own problems.