Thanks for your question.
Blisters on the legs can be due to skin problems and can be a part of systemic problem. Since you have diabetes and got previous serious infections, there is a complication of diabetes known as diabetic dermopathy, i suggest that you should visit a dermatologist rather than GP to get yourself examined and investigated. Only then a definite diagnosis can be made. Diabetics are already at risk of serious infections and diabetic related healing problems so i donot agree to your GP and advise a consultation by dermatologist and if diabetes is uncontrolled then by an endocrinologist also.
I hope this helps you.
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