In college I lifted weight for 3 weeks and got a thick stretch mark on my arm. I said fine, I just don't have to lift weights. At 21 I got some fine stretch marks on my hip from working at a restaurant. Life will go on. At 24, I developed a double wrinkle around my neck, thinning of the skin over the clavicles, and rosacea (what a year!). I thought it was from the jock itch cream I was taking and I waited for the wrinkles to fill back in which they didni't. Then I forgot about it.