I have a dime-sized hard pink lump that might be an insect bite. It s at the top of my right breast, so it is in a very sensitive spot. I m thinking it is an insect bite, but I ve never had one that has been hard like this one is. Should I be concerned, or see a doctor? It has been 3 days. I also had 2 on my back, and and another one on the back of my neck at my hairline, but they seem to be going away.