I have never been one to get blisters on my feet, I even did a 40 mile breast cancer walk with out any blisters. All of a sudden I am getting blisters everytime I do anything athletic. These are activities that I have done frequently such as running and snowboarding. Some of the blisters are in the same spots many are in different spots. I’m not using new shoes either and I have proper socks. Is this normal to happen all of a sudden.