Hello, I wear lead a collar in a heart catheterization lab, and a few days ago I took the collar off and I noticed an itchy bump on the right side of my neck; I thought it was a mosquito bite. I applied some calamine lotion to the bump, and it went away. A few days later after the bump went away, I noticed that my right mastoid process feels prominent. It is hard, painless, and immovable. Should I be alarmed? Thank you, Landis