Any piercing in the outer cartilage rim of the upper part of the ear is referred to as a 'helix piercing'. Two piercings placed one under the other in this area is called a double helix piercing.
A forward helix piercing is made in the outer rim of your ear (the helix) at the top of the rim just above the tragus, it can often be quite painful as it is made through the cartilage in your ear. You can also get a double or a triple forward helix piercing
Rather than a singular piercing, an industrial piercing is usually two (although sometimes more) piercings through the ear cartilage. The most popular kind of industrial piercing is through the anti helix and helix, connected using a long piece of barbell jewelry (or cute arrow).
The inner conch piercing is located in the lower cartilage. This puncture goes through the ear ridge, and it is usually decorated with shiny studs.
The anti tragus is the little bit of cartilage next to your lobe and opposite your tragus (see above). Depending on your pain threshold this piercing can be pretty painful both during the process and in the recovery time afterwards.
The Daith piercing is positioned at the end of the helix on the innermost part of the cartilage near to the tragus.
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This is the cartilage that sits on the outside of the ear, and not inside like the others. If you have an ear shape that folds over at the top then you will be better suited to this style.