Keloid scars are raised blister- or pimple-like formations of scar tissue which form in or around a piercing. Keloids may be red, itchy, and inflamed, or they may appear as if some skin from inside the piercing has been pulled out. Keloids seem to occur most frequently in navel piercings, and it may be assumed that the continual movement of the piercing by movement and clothes contributes greatly to these formations. Most areas can suffer from keloid but they are not as common. The guiche can suffer from keloid, especially if the wearers clothing and thighs constantly irritate the piercing. There is no way to predict whether or not a keloid scar will develop in a particular piercing - a first or second piercing may heal perfectly, but the next piercing may well flare up with some keloid scarring. .
The piercing technique used ( ear piercing gun, hollow piercing needle, or even sewing needle ) may or may not make a difference to the formation of keloid. Irritation of the piercing during healing, such as changing jewellery before the piercing has fully healed or pulling or tearing of the piercing, may increase the likelihood of scar tissue developing. Other issues like the quality of the jewellerys finish or material are highly important. Always use body jewellery and not ear rings, and from a quality supplier. If a ring has not been properly finished, the inside may carry a very subtle roughness with it. This is more than is required to start the formation of keloid in some people. Keloid forms because the skin is over granulating, you could say that the body is trying too hard to heal the piercing. If the piercing has been knocked hard during the healing period it is much more likely to form some keloid. The skin just sometimes goes into 'overdrive' and just produces too much new skin. Keeping the entry and exit points of the piercing free from lymph discharge can help to reduce the risk of keloid, but is no guarantee that you won't get it.