Hi welcome to Health care magic forum. When there is a stretch of the skin due to sudden increase of the muscle or fat under the skin there will be stretch marks
on the skin, due to breakage of the epithelial tissues of skin which is not grown upto that level .
You can try olive oil for a home remedy and i advise you to consult a dermatologist
for treatment of stretch marks, if you consult early there are medicines which will be effective.
Wishing for a quick recovery .I thank you very much for calling.