according to color of nipple discharge , you can make initial diagnosis
yellow (pus) : breast abscess
serous/greenish : duct ectasia , fibrocystic changes
bloody discharge : duct papilloma , carcinoma
milky : galactocele
also you should cover those symptoms/sign in history
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loss weight , loss appetite alarm sign of possible malignancy
bone pain , dyspnia , jaundice , abdominal pain/distension may indicate metastasis
fever , breast trauma(fat necrosis) , breast feeding hx (mastitis)
also , most important , in breast lump :
malignant - benign
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hard consistency - smooth and rubbery
painless(pain in 1/1000 - often painful
irregular edges - well defined
fixed to skin or chest wall - easily moves under skin
can cause dimpling of skin - skin dimpling unlikely
may have unilateral-bloody discharge - may green/yellow colored nipple discharge
can have nipple retraction - no nipple retraction
conclusion :
if your lump , smooth , painful , moving it is likely benign also if it painless , there are some benign nodules are painless and common
but if it painless with dimpling , retraction , fixed to skin , bloody discharge , it may be malignant