It is very difficult to remove muscles, especially those in the thigh, because it takes a whole day to walk.
Give you two choices. One is to strengthen the other leg and practice squatting on one leg (hold something with your hand or you will fall down).
There is another way, you should exercise your thighs properly (both of them), and then take some time to loosen your muscles and stretch your thighs for 20 minutes. You should stretch the thigh muscles very wide, so that the muscles will become longer. After a long time, muscle lines will fade.