Hi. Jerry is right, this needs a vet to examine it properly. The photo is very useful. It looks to me slightly swollen, ulcerated and inflamed, which would point towards a bacterial infection. But there are other possibilities too. Tony
No surprise here, youR golden needs to be examined by a vet.
Important points is what is happening over time, growing, shrinking, stable, irritates the dog, or not. Is it just hair loss, or is there some soft tissue, with fluid inside.. a hemotoma?
Our Westie (very small dog) had a hemotoma on one ear, the vet drained and prescribed some heavy duty medications.. a steroid shot too as I recall. Even so, the ear is still thick where the hemotoma was, enough so that that ear no longer matches the other erect ear (the normal position).