Please remember the r/AskScience guidelines when commenting.

• Top level comments (direct replies to a question, not a reply to another user's comment) must be an answer to the question posed, or a follow-up question to the post.
• No medical advice, speculation, or personal anecdotes.
• Answers should be supported by reputable sources and scientific research. Do not cite yourself as a source.

Comments that don’t meet these guidelines will be deleted. It’s actively unhelpful to the person asking the question to have 200 people describing a scar they once saw.