Essential oils can be applied to the outside of the throat to help with internal relief of a sore throat. Analgesic and anti-inflammatory essential oils are best.
Even better? Herbal teas, such as Throat Coat from Traditional Medicinals are very soothing and healing. Add some honey and freshly squeezed lemon for additional healing properties.
I've formulated recipes for both dry cough and wet cough based on the best essential oils and the best methods of application.