I think you need to take Phosphorous 30c, two doses on two seperate days.

Wounds heal and break out again
Wounds which appear to have healed break out again and bleed.

The rubric is

Wounds, break and heal again - carb-v, phos

Caust is definitely the remedy for burns that fail to heal, but the symptom itself is more characteristic of Phos.

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David Kempson
Dip.Homoeopathic Medicine
Member A.H.A(Australia)