Raw, unprocessed honey is what you need. I spoke lately with a beekeeper and he said that honey looses its properties when warmed over 40°C (104F) -
"Excessive heat can have detrimental effects on the nutritional value of honey.[45][46] Heating up to 37°C causes loss of nearly 200 components, part of which are antibacterial. Heating up to 40°C destroys invertase, an important enzyme. Heating up to 50°C turns the honey into caramel (the most valuable honey sugars become analogous to sugar). Generally any larger temperature fluctuation (10°C is ideal for preservation of ripe honey) causes decay.[47]" from Wiki.
In your case lavender honey is best because of the healing properties of lavender.