What complications do you see most often from using Alloderm for breast reconstruction?

Simply stated, complications from Alloderm are seroma and "red breast syndrome" where the skin may stay more pink than expected for quite some time. These two may be related. A seroma doesn't cause an infection, but a seroma can become infected. Issues such as seromas are becoming less common with modifications to Alloderm, such as perforating it (making holes in it so fluid can't collect into a little puddle in an area of the reconstruction). If you are more worried about specific issues, I would recommend discussing them with your surgeon.

Alloderm can lead to rejection and careful attention to your overlying skin may help determine how well the alloderm has integrated into your tissue. Best, Dr. Karamanoukian 

I have used Alloderm for many years in many patients and have never removed the product due to infection.  I have heard colleagues remove Alloderm in cases of  infection in breast reconstruction, and I would possibly attribute this due to precarious blood supply resulting in poor tissue perfusion.  In a single patient out of hundreds that I have used Alloderm for lip augmentation, I removed the graft after 2 or 3 days due to patient anxiety.  Possible complications are the same as in any surgical procedure such as infection either immediate or delayed, visible scars ( I have never had patients complain of scars placed at the corners of the mouth), extrusion, and hardness.  Some patients have complained that the Alloderm had completely reabsorbed, but on examination the alloderm was still present, and the patient needed a second application, which is always explained as a possibility before the Alloderm is placed.