Hi I did understand your concern. Your lesion may be a reaction to the new shoes and that can cause such problems. The blisters will slowly heal on their own. you can apply luke warm fomentation on it with a clean cloth and if they burst apply a antibiotic dressing on it with clean gauze. In view of severe pain please consult doctor. Numbness and pain over heel can be due to diabetes, electrolyte imbalance or due to nutritional deficiency or achillis tendenitis and planter fascitis I would recommend you to get evaluated for these lesions step by step as each have different treatment. i hope this helps Wish you all the best thank you for using healthcaremagic. I hope this helps