Breast burning in right breast and pain and yellow nipple discharge what can it be breast is also lumpy?

See doc: Assuming you are not a breast feeding mother, these symptoms are very concerning and you should see your gynecologist.

Nipple discharge: Nipple discharge can be normal for some. In general, white, milky, yellow and green can be normal. Blood or a brownish color can suggest a more serious condition. If this is a new finding, you should contact your doctor for evaluation. Green usually indicates fibrocystic change (I have several other posts on the subject). It does not usually indicate infection.