The square finger, moving here and there, lighted suddenly on Bitzer, perhaps because he chanced to sit in the same ray of sunlight which, darting in at one of the bare windows of the intensely white-washed room, irradiated Sissy.
About 90% of the skin's thickness is from the dermal layer of the skin, and much of the variation in skin thickness there is due to variations in collagen and elastin levels.ollagen and elastin break down with age. A gradual decrease in subcutaneous fat in the hypodermal layer of the skin also occurs with age, further decreasing skin thickness. Variations in thickness of these layers have the most dramatic effect on skin appearance.
In humans for example, the skin located under the eyes and around the eyelids is the thinnest skin in the body at 0.5 mm thick, and is one of the first areas to show signs of aging such as crows feet and wrinkles. The skin on the palms and the soles of the feet is 4 mm thick and is the thickest skin on the body. The speed and quality of wound healing in skin is promoted by the reception of estrogen.