The prevalence and severity of striae gravidarum varies among populations. Elytra are flattened with clearly visible punctures in the striae. It can also present with telangiectasia, easy bruising, purpura, and striae. Many women experience striae gravidarum during their first pregnancy. Stretch marks (technically called "striae") are also a form of scarring. These beetles show a short groove between the eyes and evident striae on the elytra. The corneal layers show edema and striae. Sculpture consisting of microscopic rather distant radiate striae, and fine dense concentric growth-lines. Stretch marks (striae) are regarded as scars by some. They can be thought of extra thick striae, typical of cardiac muscle and striated muscle. Nearly 45% percent of women develop striae gravidarum before 24 weeks of gestation. Pretty prominent striae of growth are seen upon the lowest whorl. In 1895, Wickham further explained the characteristic of the lesion, now known as Wickham striae. Elevated corticosteroid levels are implicated in striae development. Stretch marks (striae distensae) may appear on the skin in these areas.