I know it is a concern of ours when we volunteer for events such as walks or ย runs... but it is beyond our scope of practice to advise them on anything other than seek out the first aid station, keep it clean and covered... and DON't POP IT!!! ย Unfortunately these are things that they will ask us, because they are sitting in front of us looking for comfort and treatment. ย But definitely refer them to the proper area which isn't us. ย If this is a serious event such as a marathon, etc. ย This is something that their trainer should also have adressed. ย You never do an event such as this with new sneakers and you need the proper socks so that you don't get the friction that will occur. ย A friend of mine actually got blisters along her bra line from her arms chafing her sides!!! eek!!!