Commonly known as obesity line is atrophy line, also known as swelling line and white line, because pregnant people will become stretching lines. 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.

Shrinkage lines usually appear on the inner thigh, waist and abdomen, and are characterized by linear dermatoglyphics with alternating red and pale white watermelon patterns. Generally, there are many lines, which are neither painful nor itchy. Puberty shriveled lines exist not only in women but also in men. This is a physiological phenomenon in the development of healthy boys and girls. Puberty dry lines usually appear after pubic hair grows out. Men mostly appear in the inner and outer thighs and waist, while women mainly occur in the lower abdomen, thighs, buttocks, breasts and other places. At the beginning, the wrinkles are slightly higher than the skin surface, and then gradually become irregular strip or band-shaped skin depressions arranged in parallel. The skin in the depression is thin and shiny, several centimeters long and about 1 cm wide, and the color is mostly reddish or purple. After six months to two years, most of them will become light-colored marks close to skin color, which may not fade for a long time, and some will gradually fade away after puberty.

Shrinkage lines may be caused by weight loss. Fat deposition expands the skin when you are obese, and the expanded skin contracts when you lose weight, resulting in some patterns.

The formation of edema lines is because bones and muscles grow too fast, exceeding the extension speed of skin, and the elastic fibers of dermis are pulled off.