Can women develop stretch marks on arms due to wieght training?

iam 24 /f.have managed to shed of 20 kgs excess weight with a balanced diet and excercise.i have developed stertch marks on my upper arms. i also weight train too ,wanted to know whether these stretch marks on my arms are a result of weight loss or because of weight training.can i continue using weights in my workout..or will i develop any further stretch marks on my arms?