I found the source of the blisters on the bottom of my heels.
They are caused by sitting too long.
Yes, sitting!
I wear my Crocs most of the time. For those of you who may not be familiar with Crocs, they are clogs which are not tight fitting shoes. They have no backs or straps you can tighten to make them fit closely. When riding down the road for hour after hour, the vibrations of the vehicle cause my feet to move within the Crocs. That friction is causing the blisters!
I need to buy new shoes.
I hate buying shoes. I have wide toes and narrow heels. When I was a kid you could buy shoes with narrow heels. We now live in a one-size-fits-all world. Except, of course, we all know one-size-fits-none. Especially if you have narrow heels.
If you have narrow heels the heels of shoes tend to slip up and down when you walk. That, of course, causes blisters on the backs of your heels.
So it appears I get to choose between blisters on the bottoms of my heels or on the backs of them.
Joy!
TTYL,
Linda