Purple lines are usually found in the lower abdomen, inner and outer thighs, outer buttocks, axillae and popliteal fossa, and are usually purplish in color, and those caused by excessive glucocorticoids are wider than 1 cm.
Other causes of purple lines are usually less than 1 cm in width. you can usually check yourself in the mirror to see if there are purple skin lines in the above areas, and if there are any abnormalities, you can see a doctor in the hospital.