Re: Infected blister...

Lots of things you can try, see what you have at home already:

Topically - raw honey, turmeric powder, vitamin E oil, emu oil, tea tree or lavender oil etc.

If you have the turmeric, make a paste with some honey or vit e/emu oil and apply.

Use whatever you have that cures infections internally - such as raw garlic and echinacea as a natural antibiotics and use extra Vit C to kill bacteria.