Cinnamon Oil Used for Staph Folliculitis, dangerous?

Hi, I have staph scalp folliculitis, and in the past used single drops of cinnamon oil to control it when it got very bad. It works, but the oil is very potent, and if it runs on your skin, makes it very red, sore and dry.

I've recently been adding it to my herbal shampoo that I use after shaving my head (I must shave my head every day to control the infection, after it has become resistant to all antibiotics).

When I use the shampoo to clean my scalp, I have no problem with my scalp,  but have a red forehead for 30 minutes or so, due to the cinnamon.

It causes no discomfort, but in the long term, could it be a danger as regards to skin cancer, or any other side-effect?

Thank you.