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.