Let me share a little of what I found.
This from the Mayo Clinic
Medication use. Corticosteroid creams, lotions and pills and chronic use of oral or systemic steroids can cause stretch marks.
Conditions or diseases. Cushing's syndrome and adrenal gland diseases can cause widespread stretch marks, as can Marfan syndrome, Ehlers-Danlos syndrome and other hereditary (genetic) disorders.
Next question is - Just what can be done to avoid or get rid of stretch marks?
This info comes from WebMD
It is crucial to moisturize, skin becomes more pliant, more plasticized, and better able to stretch when it's well hydrated.
Many products claim to "repair" stretch marks. But only a few work.
Wheat germ oil: There is not much scientific data on whether home remedies for stretch marks, such as wheat germ oil, can help. Once recent study did find it helped improve stretch marks in their early phase.
Glycolic acid: Glyolic acid is an alpha hydroxy acid. It most likely works on stretch marks by boosting collagen production. Glycolic acid can also be administered in higher doses by a dermatologist. Treatment typically costs around $100 and requires three or four office visits before results will appear.
Vitamin C: Certain formulations of vitamin C may also increase collagen production and ehlp early stage stretch marks. For maximum effect, combine with glycolic acid. Vitamin C supplements may also be effective. Suggested amounts - 500 milligrams, three times per day.
Peptide-Containing Products - Peptide containing products are widely marketed as " repair" creams and are a waste of time and money. Despite commercial claims, there is no convincing data that any of these work.
Retinoids: Retinoids have been shown to be fairly effective in increasing collegen and elastic production in early stages. But you should avoid them if pregnant or nursing. Differin, Renova, Retin-A, and Tazorac are examples of retinoids
Glycolic Acid plus Retinoids: Using these together may give you better results. But again, they are not to be used while pregnant or nursing.
Laser treatment: This popular treatment option is used by many dermatologist , and they are being tried on stretch marks too. Lasers promote synthesis of healthy, new collagen, which has been damaged when stretch marks appear.