I was getting ready to take a shower today and I noticed a strange bump on my bicep. It was just about in the middle of the muscle belly on top on the surface. It looked like when you get a bug bite, but with no redness. It was kinda hard and as I was feeling around it, i pinched it very softly and it dissapeared. Also, there was absolutely no pain.
Any idea what this could be, and should I be concerned?