General medical complications of mastopexy include bleeding, infection, and the secondary effects of the anaesthesia. Specific complications include skin necrosis, and dysesthesia, abnormal changes in sensation (numbness and tingling). Serious medical complications include occurrences of seroma, a pocket of locally accumulated serous fluid, and occurrences of hematoma, a local accumulation of blood outside the vascular system. Necrosis of the nipple and necrosis of the skin flap (or both), when it occurs, can either be partial, and heal imperceptibly with wound care, or can be complete, and necessitate reconstruction. A complication of the Anchor mastopexy is the tension-caused wound breakdown at the junction of the three limbs of the incision, yet the scars usually heal without undergoing hypertrophy. Asymmetry of the bust is usually present pre-operatively, and the breast-lift surgery usually does not definitively eliminate it, regardless of the applied mastopexy technique or of the plastic surgeon's operative expertise. Moreover, a combined mastopexy–breast augmentation procedure can make the surgical revision of breast asymmetry more difficult because of the overstretched tissues of nipple-areola complex. Moreover, a possible, undesirable outcome of the periareolar mastopexy (circumareolar incision) is the underprojection of the corrected breast from the chest wall.