What does it feel like if a breast lump is mobile- as it's difficult to tell when it's deep in your breast?

Is it different?: Your job is to identify a change in your breast, not to figure out whether the new lump is worrisome or not. As soon as you find a new "thing", please see a doctor or other provider who can determine whether it needs further evaluation! you are right, lumps that are deeper in the breast are more difficult to identify. For this reason an ultrasound may well be appropriate. Could just be a cyst.

Wobbly: A mobile lump feels as if it can be moved an inch or so in the breast whereas a fixed lump feels as if it "crazy-glued" to the adjacent breast tissue. This is often cited as a feature that differentiates a benign lump from a cancer. However, this is an over-generalization, since cancers can feel mobile and benign lumps can feel fixed. Bottom line: all lumps need to be evaluated.