 [ Symptoms ] what are these strange lines on my left shin started appearing about 9 months ago and are not scars or pressure marks there are 8 indented lines on my left shin that started appearing about 9 months ago sometimes they are not visible but when they are they are always exactly the same i have never injured my leg so they are not scars and they are definitely not pressure marks from socks or pants they are about 1 inch long and run perfectly parallel with each other [ Disease ] that is kind of weird is not it unfortunately only a physical examination can help figure out what those marks are from your description they almost sound like stretch marks but the shin would be a very odd place to find stretch marks i would suggest you make an appointment with your primary care provider to get them looked at i do not think they are the hallmark of anything serious but i am not a doctor a physician nurse practitioner or physician assistant might see these marks as a sign of some other condition that is why i am suggesting you see a doctor this is not an emergency situation but it is worth getting checked out i realize this answer is unsatisfying but i hope you find it helpful