Is a 1 CM smooth lump in breast considered small, medium, or large?

Small, but plz C Dr. It is very difficult to distinguish normal "lumpy-bumpy" breast tissue from one that warrants further evaluation. Lumps that "count" tend to be 3-dimensionally round rather than pencil- or pancake-shaped and are harder than normal rubbery breast tissue. When finding a new lump, it is best to see your dr.;it may be wise to get a mammogram, ultrasound, or even a biopsy, depending on their findings.
Small. Smooth can be cyst or fibroadenoma or other things. Ultrasound can help solve. May need removal- as biopsy. Mammogram can define calcium or follow up.