A strange bump down my right ear?

So more than a week ago,I found this bump behind my right ear. It is located near the bottom,above the lobe. I'm sure it was matching color as my skin, because the people that checked it out said there was zilch on there. But it was sensitive to touch.
he week went on,however,I contracted to just leave it alone. It shrunk a little, and it no longer hurts when I touch it, and I surmise it even drooped a little, closer to the lobe. It doesn't really bother me, but I'm just curious as to what it is. It's been almost 10-11 days since it popped out of nowhere. I wasn't sick or anything prior, all I have are allergies during the summer. So what is it?
Answers:    depending on the size and if it has pus or not. it could be a pimple.
don't touch it, and disinfect it. if it's still in that after a period of time, go to a doctor.


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