Inner ankle bone is not sticking out like normal, there's bruising under inner ankle bone, and bruising up leg. hurts after walking only.what is this?

Think edema: If you cannot see the inner ankle like you normally do, its appearance can be distorted by swelling and makes the bone less prominent. With bruising and pain, i think you need to have it checked out by a doctor. Good luck!

Have it checked: This could be a tendon injury and or mass with swelling - have it checked out by a foot and ankle specialist/ podiatrist.