Shrinking lines are also called puffy lines and white lines, because pregnant people will become stretch marks. It is the primary striped atrophy of the skin, which is reddish at first and turns pale white after a long time. No conscious symptoms. According to different conditions, it occurs in different parts, and stretch marks occur in the abdomen and thighs. Puberty shriveled lines often appear on the inner thighs, buttocks and lower back. What happens because of taking corticosteroids can be seen in wrinkles, such as the inner thigh.