Should I be worried ?

Yes, I believe it is most likely that this is just natural pigmentation on your dog. However, for your own piece of mind and the health and safety of your beloved dog, I strongly encourage that you take her to her vet to have a professional look at it.

P.S. If you touch it and rub it and the dog doesn't wimper or complain in any way, it is more likely that it is just pigmentation. If it is not raised, it is more likely that it is just pigmentation. Have it checked though! I hope your doggie is okay!

Sincerely,

Chuck Norris

a.k.a. Dog's Best Friend

This name tells it all. Ear mites are extremely common. Greater than 50% of dogs, cats and fox are carriers of ear mites. Most infestations are subclinical and inapparent, but secondary bacterial and fungal infections can cause a nasty external ear canal infection and much irritation and discomfort for your pet. That is why proper grooming is very important to prevent such occurrence.

Grooming tips, http://tr.im/QeMs

I would get it checked out by a vet just to be on the safe side

Did you try to remove it? It could be a tick, they tend to go for the ear area.

If it is just attached at a tiny point at the tip - Its a tick.

It's probably a mole of some sort, but definitely have it checked out, just in case.

my dog had that b4 , my dog loves to scratch her head on the carpet and stuff so the vet said it was cuz she was doing that too much and said to stop her

could be a mole or mites like the other people suggest..

but any balls/lumps should always be checked out IMMEDIATELY!

O.O he might have ear mites take him to the vet

either vet or groomer to help you.