Back in May, I had a haircut. The hairdresser's clippers were quite sharp and I felt a slight 'nick' as he clipped round the top of my ears. there was no blood or anything dramatic like that and I barely noticed it. A few days later, my ears started burning and itching, specifically at the top and round the back. Eventually, I went to the GP with red raw dripping ears...and she gave me some antibiotic cream. No luck. I went back and the next GP said, "Oh that IS bad", and gave me oral antibiotics and cream. He said that if it didn't improve, he'd send off sample to the lab. Still, not much of an improvement, but too busy to go back. I started using all sorts of creams including E45 with cortisone. The condition was a bit improved, but flared up on occasions - especially when I had a lot of work on (leading some to say it was stress-related).
I got really fed up with this embarrassing problem. It was truly yukky.

Then I had a Eureka moment...!

I use reading glasses and obviously wear them more when I am working more. Surely, there could be no connection? I Googled "itchy ears and spectacles" and discovered that the plastic covers on spectacle frames contain the UV inhibitor
resorcinol monobenzoate, which is known to cause contact dermatitis in some.
I covered the plastic with sellotape and then wound some wool (liberated from Miss Nickbat) round to make them comfortable.
That was a week ago. My ears are now completely healed. No itching, no redness, no weeping fluid(!!) no flaking skin.

I guess the dermatitis was triggered when the outer layer of skin was compromised by the hairdresser's clippers as I had been wearing the glasses before without any ill effects. The only problem I am left with is to find a more aesthetic way of covering my glasses!
Interestingly, I just read about someone who had a similar problem with his hands and it was traced to resorcinol monobenzoate in the steering wheel of his car. I understand it was used in pre-1970s vehicles. It is also found in some footwear>
http://www.online.karger.com/Article/Pdf/17953