Let's have a look at what you're asking.
Hypoallergenic is a catch phrase developed by the cosmetics industry that means actually nothing, it's like new and improved which also means nothing but instills a sense of being better just from the use of the wordage. It's intended to mean "non-allergenic to the skin" or "it won't cause and infection of the skin".
Now when you say medical grade plastic, one needs to qualify this, there are several types of medical grade plastic in various formulations for various uses. Some designed to go into the dermis (skin) and some intended to just be in contact with the dermis or mucous tissue for an extended time.
Tygon is a medical grade plastic, "I.V. cannulas used to transport medications into the body", however as per the manufacturers instructions it should not be left in place any longer than 72 hours.
BioPlast / Bioflex are a medical grade plastics developed for the body piercing industry they is designed for extended wear with no ill effects to the body.
PTFE Polytetrafluoroethylene, you know it more commonly as Teflon, this is also a medical grade plastic which can be used in body piercing with no ill effects to the body.
There are other materials out there under various names, that are medical grade plastics, however you need to either do your research or trust your research into your piercer and know that he or she has done there homework and knows what they are doing and what they are using.
Knowing what plastics are safe for extended wear in specific locations is critical. So will they cause an infection? No. Infections are caused by pathogen entering the point of incision and setting up camp, this is what causes infections. Poor aftercare or over cleaning or misuse of "aftercare products" will cause irritation and can lead to infections. If you are cleaning the piercing with simple warm water rinse daily after bathing or showering and moving the jewellery to flush out the piercing you should have no issue with any of the properly applied medical plastics.
( the use of the phrase "plastic" is just a generalization for discussion and explanation, these materials listed, some of which are polymers and co-polymers and not actually "plastic")
Tygon is a medical grade plastic, "I.V. cannulas used to transport medications into the body", however as per the manufacturer's instructions it should not be left in place any longer than 72 hours. BioPlast / Bioflex are a medical grade plastics developed for the body piercing industry which are designed for extended wear with no ill effects to the body. PTFE Polytetrafluoroethylene, known more commonly as Teflon, is also a medical grade plastic which can be used in body piercing with no ill effects to the body. TR90 is an extremely durable, flexible and lightweight food-grade and hypoallergenic plastic material usually used in making eyeglass frames.
Seek professional medical attention as soon as possible, dont debate it or wait on it, do it now!
You should immediately seek medical attention for the wound incase of infection.
Of course .. if you don't you are inviting infection and/or medical problems down the road.
You shouldn't remove any piercing until after they are entirely healed. If the piercing is already infected, removing the jewelery could cause the piercing to heal over trapping the infection inside the skin which will require medical attention. But if you don't have a choice, or you've decided that you don't want the piercing anymore, (only if the piercing is NOT infected) you can take the piercing out to let it grow over, and as long as you continue aftercare until the piercing is entirely healed you shouldn't get an infection.
nobody has ever heard of anyone dying from a tongue piercing If the technique is not sterile, you can get an infection then if untreated it could get so severe that the infection would be systemic, then one could die.But this is remote considering the medical treatment available now, OR you could have an allergic reaction to the elements in the piercing, if metal or another material that would cause a reaction. Also if the piercer hits the wrong spot you can bleed to death.
An infection from a nose piercing can spread to nearby areas such as the surrounding skin, cartilage, or even into the bloodstream if left untreated. It is important to promptly seek medical attention if you suspect an infection to prevent further complications.
Pain, swelling, bad odour, discharge of blood and puss from the piercing, sore throat, fever, chills. This means you are in serious shape and medical attention is required without delay. Infected tongue piercing can go septic and require medical attention and antibiotics to treat.
I have never heard of a tongue becoming paralysed as a result of being pierced, however, there are real medical risks. The mouth is an environment with a high germ content, and piercing the tongue does create a route for possible infection, and that infection can have serious consequences, so from a medical perspective I would advise people not to pierce their tongues. Earlobes are much safer. (And if your earlobe were to become paralysed, you wouln't even notice, would you?)
It may have an infection setting in. Bathe with anti-sceptic mouthwash; if it does not improve, seek professional medical advice; do not wait long.
Medical tape is breathable. It also has a hypoallergenic adhesive so that is does not irritate the skin.
Pyelonephritis is the medical term meaning kidney infection