Bruising from surgery or any other cause generally resolves in about three weeks. On the face, this can be concealed with makeup usually at about 1-1/2 weeks. In some cases, discoloration may last longer than 3 weeks. Along an incision, like for breast augmentation, this discoloration often represents a transient increase in skin pigmentation from an increase in the activity of melanocytes (pigment producing cells). This hyperpigmentation is more noticeable in patients with darker skin types. Hydroquinone cream can help this but takes a few weeks to work. Hyperpigmentation usually takes a few months to resolve. Another cause of discoloration is hyperemia (increased blood flow). Most incisional scars will have this to some degree for several months after surgery. If you press on your scar and it turns lighter for a couple seconds, then gets more red or darker again as blood flow returns, then you have hyperemia. It is part of normal scar maturation, the last part of healing. Silicone gel sheeting, scar massage, and moisturization may help. Hyperemia is also common in the skin over areas treated with liposuction. Again, it generally takes a few months to resolve.The least common cause of prolonged discoloration after surgery is hemosiderin staining. From a health standpoint, there is nothing harmful about this. Bruising is caused by extravasated blood, blood that leaks out of the blood vessels. When the hemoglobin (the protein that carries oxygen and makes blood red) breaks down, the main breakdown product is hemosiderin, which is then taken up and carried away by cells called macrophages. Sometimes hemosiderin may persist in the tissues. This causes discoloration. Generally this improves, but like hyperpigmentation and hyperemia, it also takes months to do so, and staining can occasionally be permanent. Certain types of lasers may help. Hydroquinone has been used. Green tea and other healthy foods rich in antioxidants and vitamin C may help also. Discuss options with your surgeon.Lastly, for lower eyelid surgery (blepharoplasty), some patients may still notice persistent mild dark circles under their eyes after surgery. The lower eyelid skin is thin and delicate and in most patients actually shows the color of the orbicularis oculi muscle (the squinting muscle) through the skin. Surgery can beautifully smooth and eliminate lower eyelid bags and shadowing, but the reddish tint of the muscle may still show through the skin. This can be confused with hemosiderin staining. Thanks for your question.