Hi thanks for contacting HCM... Noted your friend having bleeding from scar of mastectomy... Here consultation to surgeon done without delay to prevent further complication.. Here breast must be examined by palpation for detecting any mass... If mastectomy in past done for malignancy then there can be development of malignancy from residual tumour cell. If mass palpable FNAC done.... If palpation normal then bleed may from scar that might hypertrophied ... If scar is seems to be infected then antibiotic needed... Brufen like antiinflammatory drug given... Take care. Dr.Parth