Doctor, I really need your help. Please. I have a hickey on my neck. My mom saw it. She drove off without a word. I think she knows what it is. But when she asks me later, I don't want to tell her the truth. What can I tell her? Does a knife leave a mark on your body that looks like a lovebite? I was planning on saying I wanted to kill myself and I chickened out. Hence, the marks from the knife. Do knives cause marks like this on the neck?