The health risks with conventional earlobe piercing are common but tend to be minor, particularly if proper technique and hygienic procedures are followed. One study found that up to 35 percent of persons with pierced ears had one or more complications, including minor infection (77 percent of pierced ear sites with complications), allergic reaction (43 percent), keloids (2.5 percent), and traumatic tearing (2.5 percent). Pierced ears are a significant risk factor for contact allergies to the nickel in jewelry. Earlobe tearing, during the healing period or after healing is complete, can be minimized by not wearing earrings, especially wire-based dangle earrings, during activities in which they are likely to become snagged, such as while playing sports. Also, larger gauge jewellery will lessen the chance of the earring being torn out.