"ripples" from weight loss or sign of cancer?

Depends on if the weight loss was healthy or not. Too much too fast is unhealthy for everyone and can have unpleasant side effects. I actually have stretchmarks from my initial weight gain that haven't disappeared and are more visible with the weight loss. Could that be what it is? Otherwise, try a self -exam and see if you have lumps, and if you think you do, go see a doctor.