Is Dermatomyositis and Polymyositis contagious?

Dermatomyositis and polymyositis are not contagious; they are inflammatory autoimmune conditions and cannot be spread from person to person through touch, air, or bodily fluids. You cannot "catch" these diseases from a family member, friend, or coworker, and there is absolutely no risk to those living with or caring for someone diagnosed with these conditions.

What causes Dermatomyositis and Polymyositis?

Dermatomyositis and polymyositis are chronic autoimmune diseases, meaning the body’s immune system mistakenly attacks healthy muscle tissue and, in the case of dermatomyositis, the skin. While the exact underlying trigger remains a subject of intense medical research, it is widely accepted that these conditions result from a complex interplay between genetic predisposition and environmental factors. In these diseases, the immune system produces autoantibodies that target muscle fibers, leading to inflammation, weakness, and tissue damage. It is important to emphasize that this internal immune dysfunction is not an infectious process, and no virus, bacteria, or fungus is responsible for the onset of these conditions.

Why is there confusion regarding the "contagion" of these diseases?

Patients often face social stigma due to a misunderstanding of the term "inflammatory." Because many common infections (like the flu or skin infections) cause inflammation, people sometimes mistakenly assume that any condition characterized by systemic inflammation must be contagious. Furthermore, because dermatomyositis and polymyositis can sometimes be triggered by an initial viral infection—which acts as a catalyst for the immune system to misfire—some people incorrectly conflate the trigger with the disease itself. To clarify: while a virus might have "woken up" the immune system in a susceptible person, the resulting autoimmune disease is a permanent internal state, not an infection that can be passed to others.

Are there environmental triggers for these conditions?

While Dermatomyositis and Polymyositis are not infectious, researchers have identified several environmental factors that may trigger or exacerbate symptoms in genetically susceptible individuals:

• Ultraviolet (UV) Exposure: Specifically in dermatomyositis, sun exposure is a well-documented trigger that can worsen the characteristic skin rashes.


• Medications: Certain drugs have been known to induce myopathy symptoms in rare instances.


• Viral Infections: Exposure to common viruses can occasionally act as the initial "trigger" that shifts the immune system into an overactive, autoimmune state.


• Environmental Toxins: Ongoing research continues to examine the role of silica or other environmental pollutants in triggering systemic inflammatory responses.

Is it safe to interact with someone who has Dermatomyositis or Polymyositis?

Living with, hugging, sharing meals, or providing care for someone with dermatomyositis or polymyositis poses zero risk of transmission to you. The 413 members of the DiseaseMaps community who share their experiences with these conditions are not "shedding" a disease. Because these patients are often on immunosuppressive medications to manage their symptoms, it is actually the patient who is at higher risk from the outside world, as their immune systems are intentionally suppressed to prevent further inflammation. Protecting their health is a priority, but you are not a threat to them, and they are certainly not a threat to you.

Next steps

• Consult a Rheumatologist: Work with a specialist to manage inflammation and monitor your immune health.


• Join the Community: Connect with the 413 members on DiseaseMaps.org to share experiences and combat the isolation often caused by stigma.


• Educate Your Circle: Share factual information from the resources below with family and friends to dispel myths about contagion.


• Keep a Symptom Journal: Track potential environmental triggers, such as sun exposure or stress, to discuss with your clinical team.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Information on Dermatomyositis and Polymyositis.


• Orphanet: Clinical database for rare diseases and orphan drugs.


• The Myositis Association: Comprehensive patient resources and research summaries.


• OMIM (Online Mendelian Inheritance in Man): Genetic data regarding autoimmune predisposition.