Is a dark purple bruising and swelling of the nipples normal after Breast Augmentation and Lift?

I recommend discussing with your surgeon immediately.  It may be that the nipple is becoming necrotic and any way of relieving the tension around it may salvage it. 

Although tis may be a result of bruising and superficial bleeding I would have concerns that the blood supply to the nipple areola complex is compromised. You must see your PS immediately to rule out compromise and if there is compromise urgent attention to the reason for the compromise.