Yup, plus a cushion with a hole in to take the pressure off the core. Don't know what the ointment is yet.
What can you get fro a drawing slave/poultice where you are?
There are quite a lot available, but I would use this one if it is still not opened:
https://www.amazon.de/dp/B01MS7WCFV/?tag=zugsalbetest-21
And RIVANOL for the open and scraped out hole to fill it up before fitting the cotton pad as a cushion and wrap it up. https://www.shop-apotheke.com/arzneimittel/6185615/rivanol-salbe.htm