Sapphirez,
All the best to you and your father
On severe injuries...I would say the same as Miss H...olive oil and honey...for deep healing, you may also mix in powdered vitamin c in buffered form only and only when the healing is underway. It is also important to take Vitamin C and probiotics internally, preferably at times opposite to when he is taking any other medication, so as not to interfere. Otherwise the VC will tend to wash the meds out of his system if taken together.
Goldenseal tea can be used as an anti-bacterial/anti-fungal wash and also consumed internally...but it is a very powerful herb and may affect his other medicines, so you may want to just use it externally as a wash for disinfecting and healing.
Peace & blessings,
7L
__________________
Bound by conventions, people tend to reach for what is easy.
Here we must be unafraid of what is difficult.
For all living beings in nature must unfold in their particular way
and become themselves despite all opposition.
-- Rainer Maria Rilke