I don’t know this website:
https://www.medicalnewstoday.com/articles/316572#home-remedies

3. Wearing 100 percent cotton socks to bed

Medical treatments

In severe cases of cracked heels, or if medical care is required, a doctor may:

“remove dead skin
prescribe stronger softening or removal agents
apply medical glue to seal cracks
prescribe an antibiotic if there is an infection
strap the heel with dressings or bandages
recommend shoe inserts, heel pads, or heel cups
help the patient change how they walk”