Complications of tattooing and body piercing:

• Hepatitis B and C
• Scars and/or keloids
• Infections (minor or severe)
• Blood poisoning
• HIV

Cosmetic risks

• deforming scars or holes that are larger than expected
  

Remorse

• many people regret the piercing or tattoo once it is done
• the fashion may change…..while the piercing can be made less obvious by removing the jewelry, removal of tattoos is painful, costly, difficult to eradicate totally, after MANY treatments, and can leave scarring
  

The dangers associated with tongue piercing:

• the tongue is a very strong muscle. When pierced, you run the risk of permanent damage, making it difficult to speak and/or eat. There can be altered taste sensations, numbness, and increased salivary production causing drooling
• the incidence of post-piercing infection is high, due to the large amount of bacteria in the mouth. Severe swelling can occur and cause difficulty breathing
• excessive bleeding can occur
• damage to the teeth and trauma to the gums can occur from the barbell. Broken or chipped teeth due to accidental biting of the barbell can occur. Recession of the gums secondary to the barbell rubbing the back of the lower front teeth can cause damage to the roots of the teeth and bone loss with eventual tooth loss
• loss of the plating of the barbell can cause infection, blood poisoning or an allergic contact dermatitis
• if the barbell becomes unscrewed, one of the balls can come off and cause a potential choking hazard.

WebMD has a great information on How Safe Is Permanent Makeup? Learn more