An industrial piercing, as typically found in the upper cartilage of the ear, is made up of two piercings connected with a bar.
This type of piercing is not an easy to handle. It could be very painful and prone to infections. The best way to avoid any risks, is
to follow your piercer's after care advice. Typically, this piercing heals for about 3-4 weeks to six months. You should be careful during the healing time. In order to avoid any complications, here are some tips:

After you get your pierced, you should be extremely careful and do your best in cleaning the pierced area.
This means, before you touch the piercing, you should always clean your hands with hot water. The best way to protect
yourself from infection is to use an antibacterial soap. So before touching the pierced area make sure your hands are clean.

Lean your head under a faucet and run warm water on your ear for 30 seconds. This loosens up dried skin and crusted areas around the piercing.

Lather up antibacterial soap and warm water and lightly rub the metal rod with your pinky, twisting the piercing around to coat it with soap. Work the soap behind the rod on the inside of your ear and around the pierced holes for three minutes. Rinse your jewelry and the piercing by allowing the water to flow onto your ear until all the soap is gone from your piercing and jewelry. Pat your piercing and ear dry with a disposable paper towel.

Also, a great way to clean the pierced area is to use some sea salt. Simply, fill a bowl with 1 cup of warm water and add 1/4 cup of sea salt. Dip a gauze pad in the water and clean your ear with it. Repeat this one or two times a day.

Ask your piercer about saline or sea salt soaks if your navel piercing is irritated during the healing process. Avoid harsh products, such as alcohol or hydrogen peroxide, as cleaning agents for your navel piercing will lessen the risk of a longer healing period.

What to avoid:

Wearing hats, unclean clothes
Changing the jewelry
Saunas, Pools, Sea etc
Taking off the jewelry for at least 3 weeks
Touching the piercing with dirty hands. Touching it will cause bacteria to spread and pain.
If you believe you may have an infection, see a doctor or the person that did your piercing.
Do not use rubbing alcohol to clean jewelry while it is in your ear as it will irritate the area.
If you notice yellow discharge, redness or red lines, swelling or have extreme pain see your doctor as your piercing could be infected. Do not use gel-based ointments that will prevent air from getting to your ear. Doing so will protract the healing process.

During the healing phase - Avoid sports, especially sports that involve physical contact, to best care for your piercing. An industrial piercing is extremely sensitive and even the smallest amount of abrasion or chafing may cause it to heal incorrectly or could even cause infection. You should sit out any sporting events or regular exercise routines for at least 2 weeks following your piercing procedure.

The jewelers are extremely important especially for the first piercing. The preferable metal is titanium, as this one is the most convenient and does not contain toxic substances, which reduces the chances of allergies, suppuration and infections. Normally, it is essential that the piercing has the appropriate size for the body spot where it is going to be placed.

And of course, avoid piercing in unprofessional conditions.

CHECK OUT:
Genital Piercing Risks
Preparing To Get Pierced
Choosing a Reputable Piercer
When To Avoid Piercing
Piercing Jewelry Safety
Piercing Pain & Rejection