Discoloration of nipple. Is this normal or possibly the onset of necrosis? (photo)

Hoping to get some insight before my appointment but I will also contact my ps. I am 7 days post op from a breast reduction. I just noticed some yellowing of the areola and paleness of pigmentation. Had bruising post op but turned yellow 3-4 after and PS said nothing about any complications during appointment. I have sensation and the nipple itself appears pink/red when touched. I do not smoke/ no discharge or bleeding since operation day.