I'm 19 years old and I've had lumps in my breasts before. I had them checked out but the doctor said they weren't a risk but I've recently noticed a different clot in my one breast. It's hard as a rock at the bottom of my breast. If I raise my arm it makes a visible bump in the round of my breast. It doesn't hurt and I can move it a little, it isn't very big... should I get this looked at??