My dog has a pimple under the ear flap which is getting bigger, what should I do?

Take it to the vet to get it checked out, better safe than sorry|||you could let it go away on its own or as long as your dog isnt frightful and it isnt too close to the opening of the ear then pop it with a needle.|||Are you sure it%26#039;s a pimple? It could be a tumor or an abscess. Best thing would be to see a vet