Prevalence and risk factors associated with the formation of dermal lesions on the foot during hiking

Abstract Background The aim of this study is to assess the prevalence of blisters on the foot during hiking and the factors associated with this condition. Material and methods A cross-sectional observational comparative study was conducted of 315 patients treated at two hostels, located on the Way of Saint James, in northern Spain. The study participants were interviewed and clinically examined to obtain sociodemographic and clinical variables. The variables recorded concerned the type of terrain covered (asphalt or dirt trails), the weight carried (backpack), the footwear used (weight, type, impermeability), the type of socks worn and the hydration of the skin obtained. The inclusion criteria were at least 18 years and to walk at least 20 km in the last five days. Results 74% (n = 233) of the hikers presented a bullous lesion on the foot after completing several stages of hiking. The most frequent locations were the first or second metatarsal head and the fifth toe. Logistic regression showed that risk factors for the appearance of blistering were the number of kilometres walked on asphalt (p = .001 [95% CI (1.019–1.064)]) and having wet socks at the end of the day (p = . 006 [95% CI (1.286–4.479)]). The protective factors identified were walking on a dirt, grass or gravel surface (p  Conclusions The type of terrain is a determining factor in the appearance of blisters. Walking on a dirt trail reduces the risk. Using custom made insoles and controlling humidity are other factors that should be considered as preventive measures.