As do I Nancy.  Heal pain/pressure primarily  due to lymphedema & secondary to immobility of your feet /heals requires vigilance.

>Daily visual inspection either by care giver or self via mirror, take pic of site.

> Frequent repositioning  with support beneath mid/lower calf. DIY prepped small  tubular shapped foam wrapped towels or pillow. 

This aides to elevate that foot/heel avoids/reduces excess  friction.

>Must keep skin clean.

>Moisturized  skin yields tissue surface without cracking always applying gentle message.

>Try a heel protector constructed of light weight  foam, "egg crate" type shell with synthetic washable sheep skin linings.  Like soxes/shoes you should  switch/rotate between a few types. Truly this choice is trial to determine best fit.

Best of luck.