Hi need some advice and anyone who has been through  similar to myself.

Roughly 4 months ago my son dug his elbow into my breast by accident. A few days later i found a small lump and was very tender and sore for over 1 months. The pain subsided went away eventually. However 2 months ago i was wearinga new /tight bra and  few days later the lump doubled in size and became sore again. Seen gp who said nothing to worry about and was told it was an infection and was given antibiotics. A few days after round the injury it started to bruise so i thought it was getting better. After antibiotics were finished lump was still there so seen gp again who thought it was an abcess and would refer me to breast clinic. Attended breast clinic, was given mammogram ultrasound  and biopsy. Technician said part of lymph node at arm pit was slightly enlarged. Specialist then said it look more than likely to be cancer and would need to wait on biopsy results. Juat cant get my head round it could be cancer due to my injury exactly where the lump is. Lump is hard to touch and roughly 4inches. Has anyone had an injury like this and biopsy came back clear?