To moisturise your ears try dropping 1-2 drops of olive oil in them twice a day, for about a week.
If that doesn’t stop the itching, you may need to use an anti-fungal; put a few drops of garlic infused olive oil (you can buy it or make it yourself) in one ear and plug it with some cotton wool. Leave it in all day and repeat it at night. The next morning you should cleanse your ear with hydrogen peroxide (I use Otex ear drops which contain hydrogen peroxide). Repeat the process with the other ear.
Hope this helps!