Can Pulling Hair Out Once Cause Permanent Hair Loss?

I’m a 25-year-old male with short hair. About ten months ago I was unhappy with how my hairline looked, so I pulled out a large chunk of hair at once using a knife rather aggressively. I have noticed that my hairline has moved back since then and it has become thinner. No bald spots but an overall thinning. My question is: can pulling your hair once cause traction alopecia and is this reversible? Will my hairline return to normal if I never do it again? Thanks in advance.

I am not sure that what you are describing makes sense. If I was to pull out a hair on your head, it would most likely regrow if it was not subject to genetic balding; however, what you describe does not sound that way since you mentioned using a KNIFE? I really can’t answer whether it’ll regrow in your case, as I do not understand what you did.

Generally though, hair loss from pulling only becomes permanent after it is done repeatedly over time.