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What is Plastic Allergy?

An allergy occurs when your cat’s immune system overreacts to an element that it considers to be an intruder. While allergies to plastics are rare in pets, they can occur. It can be a challenge to diagnose an allergy to plastic as there are numerous allergens that can be causing a reaction in your cat. Plastic is present in many household items (like shoes and carpeting) and pet products so an allergy to plastics can be hard on your cat.

When a cat is experiencing an allergy to plastics, it is the result of their immune system overreacting to the irritant upon having contact with it.

Symptoms of Plastic Allergy in Cats

Skin reactions can occur in your cat should he have an allergy to plastic. The symptoms may be in the area of contact and/or seen under the front legs and between the toes, as well as around his face and groin. Should your cat experience an allergy to plastics, the following symptoms may be seen:

  • Scratching, biting and/or licking his skin
  • Hair loss
  • Skin rashes
  • Blisters/lesions or skin ulcerations
  • Coughing/breathing difficulties
  • Facial and limb swelling
  • Appearing lethargic
  • Chronic ear infections
  • Inflammation in his paws
  • Shaking of his head often
  • Hives

Types 

There are different types of plastic that can be present in many different products; your cat can have an allergy to one or more than one of these types. Some common types of plastic include:

  • Polyethylene terephthalate (PET or PETE): This type of plastic is often used to make medicine bottles, jars and rope. It may also be contained in recycled carpet
  • High-density polyethylene (HDPE): This is often contained in milk jugs, small toys and bottles that hold shampoo and conditioner
  • Polyvinyl chloride (PVC): Most common in plumbing pipes and industrial grade products
  • Low-density polyethylene (LDPE): A flexible plastic that is found in sandwich bags, plastic wrap and grocery bags 
  • Polypropylene (PP): This type of plastic can handle high temperatures and is often present in Tupperware and bottles of syrup
  • Polycarbonate: Found in baby bottles, cd’s, and eyeglasses, this type of plastic performs well in high impact situations

Causes of Plastic Allergy in Cats

A contact allergy occurs when the mast cells of your cat’s immune system mount an aggressive response to an element or elements of the plastic. The role of the mast cells is to protect your cat’s body from pathogens. Should your cat’s immune system be triggered by a substance, the mast cells will release a histamine (a compound that occurs naturally and causes inflammation in the tissues it comes into contact with) in order to combat what is seen as an intruder. The histamine leads to itchiness and inflammation in your cat’s skin.

Diagnosis of Plastic Allergy in Cats

Should you notice concerning symptoms in your cat, you will want to take him to the veterinarian for an examination. Your veterinarian will conduct a full physical exam and ask you for details in regards to the symptoms you have noticed, when you first saw them and any changes you have observed. Upon viewing the skin symptoms in your cat, your veterinarian will likely take a sample of his skin cells through skin scraping. This will allow him to view the cells under a microscope to see if there are any parasites, yeast or bacteria that may be causing his symptoms. Upon ruling those out, your veterinarian will consider possible causes of an allergic reaction. 

In allergies to plastics, skin reactions are often present around your cat’s face and groin, under his front legs and between his toes; though they can be in other locations of his body. Should your veterinarian think your cat is experiencing an environmental or contact allergy, he might recommend a patch test (also called an intradermal skin test) in order to confirm what is causing his symptoms. This testing involves injecting a very small amount of the allergen that your veterinarian suspects is causing the problem under your cat’s skin. This will cause a local reaction. Since plastic is not a common allergen for cats, unless it is suspected it may not be a part of the patch test. Often, an allergy to plastic will not be confirmed until all other possible allergens are ruled out, leading to plastic being a consideration.

Treatment of Plastic Allergy in Cats

Upon confirming that your cat has an allergy to plastic, your veterinarian will consider how to treat his allergy. Antihistamines are often the first option to try, though they are found to not be effective in all cats and over time your pet may develop an immunity to them. Shampoos and topical ointments that contain hydrocortisone are useful to minimize itching and discomfort, though you will want to do your best to ensure that your cat does not lick these products off as the chemicals can be toxic. 

Corticosteroids (either injected or administered orally) are an option, however while they are effective, they can have serious side effects upon long-term use. Because of these potential side effects, your doctor will want to monitor your cat’s blood chemistry levels while he is being treated with corticosteroids so as to make treatment changes as necessary. 

Immunotherapy is another option, though this can be time consuming and expensive and is therefore not readily available.

Often, cats with an allergy will develop a secondary bacterial infection as a result of excessive licking and scratching of the affected areas. Should that occur, an antibiotic will be prescribed.

Recovery of Plastic Allergy in Cats

It is important to work with your veterinarian on how to best treat your cat as you seek to reduce or eliminate his exposure to the plastic he is reacting to. In some cases, medication will need to be continued even once symptoms have resolved themselves. Follow-up appointments may be necessary so that your veterinarian can check on the results of recommended treatment and make any necessary changes.

Plastic Allergy Questions and Advice from Veterinary Professionals

Casper
short hair
3 Years
Mild condition
0 found helpful
Mild condition

Has Symptoms

dark spot on tail

My cat has had a plastic allergy on her nose from nudging the door to her litter box. She was treated with steroids from vet and I removed the door. Now I see a dark spot on her tail with little dots around it Could it come from tail rubbing on the top of the litter box? I don’t want to treat her with steroids again. She’s not bothering it. Will it go away o it’s own if I remove the litter box top.

Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
3192 Recommendations
Without examining Casper’s tail, I cannot say whether or not it is related to a plastic allergy or another cause; if the area isn’t causing any discomfort you may try removing the top of the litter tray and regularly bathing the tail with a mild cat shampoo. If there is no improvement or it gets worse, you should visit your Veterinarian for an examination. Regards Dr Callum Turner DVM

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Kilo
Unknown
8 Years
Mild condition
0 found helpful
Mild condition

Has Symptoms

Lip
Swollen lip

Second time this has happened. First was from a rug that smelled strong of the plastic backing. This time I don't know what happened. Got a new carpet cat scratcher, a new heater, and an exercise ballence ball. I removed the balence ball. What else can I do?

Dr. Michele King, DVM
Dr. Michele King, DVM
1520 Recommendations
Thank you for your question. Without examining Kilo, I am afraid that I cannot comment on what is happening - I'm not sure if Kilo is a cat or a dog, and what actually occurred. It would be best to have Kilo seen by your veterinarian to assess Kilo's health, and what might be causing the problem that is concerning to you. I hope that Kilo is okay.

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Flower
Domestic cat
2 Years
Mild condition
0 found helpful
Mild condition

Has Symptoms

Sore around mouth

Medication Used

steroids

My 2yr old female cat has been treated for sores around the mouth many times by the vets with steroids. They clear up, go for a while,then appear again. She hasn't got fleas or worms , she has spot ons every month. I have seen her licking plastic bags. I have tried to hide all plastic bags from her. It doesn't seem to bother her, but it looks so sore. Is there anything else I can do to help her?

Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
3192 Recommendations
If it appears that plastic is the cause for the irritation around the mouth, I would recommend just making sure there are no plastic bags around; I know it is simple and what you’re trying to do already but it is the best course of action. There really isn’t any other practical long term solution if this is the case. Regards Dr Callum Turner DVM

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Paya
Manx
2 Years
Mild condition
1 found helpful
Mild condition

Has Symptoms

shedding
scratching
Licking paws
Hair Loss

Medication Used

Revolution
anti fungal lotion
Convenia

We've been dealing with Paya's itchy skin since I adopted her a year ago. With her vet, we ruled out a flea allergy and found an allergy to chicken, but she was still quite itchy. It recently got warmer, and she scratched up a sore spot on the back of her neck and on her throat, which healed up since we started using an air filter and not opening the windows. She was treated with an antibiotic and an antifungal medication as well and completed her treatment. Despite that, she still has random flare ups of itchiness, and if we aren't monitoring her she may do damage. I noticed that she rubbed against a plastic box with her face and not even a few minutes later she was scratching above the eye sporadically afterwards.

Dr. Michele King, DVM
Dr. Michele King, DVM
1520 Recommendations
Thank you for your email. Paya may have allergies or sensitivities to other things that you can't control in her environment - she may benefit from anti-histamine therapy, and it would be a good idea to discuss that possibility with your veterinarian - there are a number of medications available for allergies that they can recommend for her. I hope that everything goes well for her.

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Pickles
Orange tabby
9 Months
Mild condition
0 found helpful
Mild condition

Has Symptoms

Allergy
Black dots on nose
Black dots on lip
Swollen lip

My cat has a reacurring swollen lip and about 4 black dots on his lip and some on his nose as well? .

Dr. Michele King, DVM
Dr. Michele King, DVM
1520 Recommendations
Thank you for contacting us about Pickles. If he has a swollen lip, and black spots on his skin, he should probably be seen by his veterinarian - without more information, I cannot diagnose anything and do not know if he is having a problem. That is not normal, and should be examined to make sure that he isn't having some type of reaction that needs to be treated. I hope that he recovers well.

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