Yellowish pigment on breast

Hi mummies! Wanna ask if it's normal to see a yellowish pigment at the top part of your boobs? It doesn't hurt tho. Initially i thought i might have knocked on to something and causes a bruise or blue black... but it has been there for ard 2 weeks now and it doesnt hurt at all. #firstbaby #1stimemom #pregnancy #advicepls