Blisters are a common, yet debilitating condition that affects runners. The best defenses are foot powder, lubricant, and good shoes and socks. Athletes should remove calluses and rough spots on their feet and also trim and smooth toenails before each race. If an existing blister bursts during the run, it can be prone to infection, so use an antiseptic on it as soon as possible post-race, followed by professional treatment.
Shoes need time to ‘break in’ and if you don’t give them adequate time to do so, you may find they are a haven for blisters.