Lump in breast. Please please advise!

My mom suddenly got a lump in her breast ( right breast) it's some in centre n round when touched from middle...it's painful as well..she is having this from 4 days now ...on first day even there was discharge of some fluid from nipple like yellowish colour...we actually pressed it n removed ..now we don't see any more discharge after first day..my mom don't get her periods also ...it's been 3-4 years now. Long back around 14 years back also she had got some redish lump , doctor sent for biopsy but no issue so they gave medicine n it was ok I remember my mom gets like lumps sometimes n it disappears on own ..it's been a while now so i m worried what is the issue .. please advice what to do...can I put hot compress to see it helps? Not sure cold or hot compress...when to visit doctor please please advise