Hi Pooja,
Getting stretch marks after weight loss is quit a common problem, to get rid of this go for toning exercises. With the help of resistance bands and tubes, dumbbells or even calisthenic exercises you can tone tour body. Apart from this their are some Anti-stretch creams, gels, serums and lotions available in market which claims to fight against stretch marks , consult your dermatologist and choose what suits your skin type.