It's not particularly unusual to see stretch marks on a young man's back. During puberty, when a youth is growing rapidly, his skin is required to stretch faster and farther than it's capable of doing. Males have a tendency to get stretch marks on their backs.
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Boys Yes, Girls, No
Girls, unlike boys, generally will get stretch marks--if they get them at all--on their breasts, hips and thighs rather than on their backs, according to Warwickshire.nhs.uk.
Stretch marks can occur any time that rapid growth takes place, which causes the skin to be stretched. The marks actually take place in the dermis of the skin (the middle layer), which supports the epidermis (the outer layer). In the case of back stretch marks, if a young male is getting taller and wider so rapidly that his body can't keep up, the fibres in the dermis on his back become thin due to being overstretched. At that point, the fibres break.
Red to White
Stretch marks look red when they first appear, although they'll fade into a white or grey colour. The red colour is because of the presence of blood vessels that lie beneath the skin, which are revealed when the fibres in the dermis break and little tears result.
Marfan Syndrome is a disorder that causes stretch marks on the back and elsewhere. This disease, which is genetic, affects connective tissue in the body, according to Medicinenet.com. The connective tissue is defective and isn't able to provide a framework for development and growth. Those with Marfan's can get stretch marks even though their weight doesn't change. These stretch marks can strike at any age but don't pose any serious health risks.
Glucocorticoids, which are secreted by the adrenal glands, have been found to prevent fibroblasts from regenerating and repairing elastin and collagen. The medical community isn't sure if glucocorticoids cause the stretch marks or just make the appearance of them on your skin more likely, according to Dermstore.com (see Resources). If an individual is using skin ointments or creams containing steroids (e.g. hydrocortisone) for an extended period or is taking high doses of oral corticosteroids, this can result in stretch marks on the lower back and elsewhere, according to Kidshealth.org (see Resources). Bodybuilders and weightlifters have a tendency to get stretch marks because of their rapid weight gain.
Possible Melanin Connection
Another possible reason for stretch marks on your lower back or elsewhere is the theory that when the skin stretches it affects skin pigment, or melanin. It's possible that dermal collagen becomes damaged during stretching, and that's when blood vessel dilation occurs and red stretch marks form. The theory is that collagen remodelling and inflammation result in the loss of melanocytes cells, which produce pigment, or the pigment becomes obscured due to the thinning and stretching of the skin.
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