Stretchmarks are invading my legs?

first they were on just my upper inner thighs so i was fine bcuz it was normal. now they r spreading everywere. EVERYWERE! they go all down the side of my legs and there all over my hips and . im 15 and i weigh 110 lbs i havent lost or gained weight in a while.i put palmers cocoa er 4 stretchmarks on them but it doent help. is there anything i can do?!