You will just have to go through with it, I had the same problem and still do, its completely natural, Use boots of good quality and if still it tings, Use socks with extra padding's. It just means your body is not yet used to it. Use this exercise to help you get used to it faster. Place 10 balls in a Row, Shoot them one by one with all the Power you have and target it towards the frame, All 10 should be shot like you wish to score in a match with accuracy and power, but remember not to take time to stop between shoots. Hope this helped
maybe give kicking the ball a break for a bit and put some ice or something on it when it gets like that, i find it helps the best. maybe in time it will heal and come right.
