About Dermatomyositis
Dermatomyositis is a rare inflammatory disease that affects the muscles and skin. It is part of a group of conditions called inflammatory myopathies, diseases that cause muscle inflammation and weakness.
Dermatomyositis involves chronic muscle inflammation, weakness, and sometimes pain. Both children and adults can be affected by dermatomyositis. The condition is characterized by a unique skin rash that typically appears on the eyelids and muscles used for joint movement, such as the knuckles, elbows, knees, and toes. The rash may be patchy and have purple or red discolorations. In some cases, there may also be swelling in the affected areas.
Dermatomyositis can cause muscle weakness that worsens over time and may impact movements like walking, climbing stairs, or lifting arms overhead. Adults with dermatomyositis may experience additional symptoms such as weight loss, low-grade fever, inflamed lungs, and sensitivity to light. Calcium buildup under the skin or in the muscles (calcinosis) can also occur in both children and adults with dermatomyositis.
The exact disease mechanism and causes of dermatomyositis are still unknown. However, experts believe that a combination of factors contributes to the development of the condition. These factors include:
- Genetic factors: Certain human leukocyte antigen (HLA) types, specific proteins found on the surface of most cells in your body that play a key role in the immune system, have been associated with a higher risk of dermatomyositis.
- Immune factors: Abnormal immune reactions, where the immune system mistakenly attacks healthy muscle cells and blood vessels, are observed in people with dermatomyositis.
Non-modifiable risk factors for dermatomyositis, which are unchangeable risk factors for the disease, include:
- Genetics: Having a family history of Dermatomyositis or other related autoimmune diseases may increase the risk.
Modifiable risk factors for dermatomyositis, which are changeable risk factors for the disease, include:
- Environmental factors: Exposure to high-frequency UV radiation and certain viruses like parvovirus, enterovirus, Coxsackie B virus, echovirus, and HIV may trigger or worsen the condition.
- Medications: Certain drugs, such as anticancer drugs, antibiotics, and nonsteroidal anti-inflammatory drugs, can also trigger dermatomyositis.
Remember that these risk factors are not definitive causes for dermatomyositis, and more research is needed to fully understand the development of the disease. If you have concerns about your risk or symptoms, it is important to consult with your healthcare professional for a proper evaluation and guidance.
The most common early symptoms of dermatomyositis are usually skin-related and include:
- Muscle weakness: The most common symptom of dermatomyositis. It can affect various muscle groups such as the neck, hips, thighs, shoulders, and upper arms. This can lead to difficulty carrying out activities like combing hair, lifting arms, climbing steps, dressing, getting up from the floor, and raising the head from the pillow.
- Red or bluish-purple patchy rash that can appear across the shoulders and upper back, over the knuckles with changes to the cuticles and nail beds, on the palms and fingers, over the elbows and knees, around the eyes, and on the upper chest in a V shape.
- Gottron papules: Scaly, red areas that often appear over the knuckles.
As dermatomyositis progresses or reaches higher severity, other common symptoms may occur:
- Difficulty swallowing (dysphagia) and speaking (dysphonia)
- Breathing difficulties
- Abnormal heart rhythms (arrhythmia) and heart muscle weakness (cardiomyopathy)
- Gastrointestinal symptoms
- Lung symptoms
- Ragged cuticles exposing blood vessels at the nail bed
- Scaly scalp resembling dandruff
- Thinning hair
Remember to consult your healthcare professional for an accurate diagnosis and appropriate treatment.
To diagnose dermatomyositis, healthcare providers commonly perform the following examinations, tests, and procedures:
- Physical exam: The healthcare provider will look for physical signs of the condition, such as skin rashes and/or changes, as well as muscle weakness on the body.
- Lab tests: Specific lab tests, such as blood analysis, and skin or muscle biopsy, may be recommended to check for markers of inflammation and muscle damage.
- Imaging studies: X-rays or MRI scans may be conducted to assess muscle and organ involvement.
To determine the stage or severity of dermatomyositis, healthcare providers may recommend the following additional examinations, tests, and procedures:
- Follow-up exams: Regular follow-up exams are important to monitor any changes or worsening of symptoms.
- Repeat lab tests: Periodic lab tests can help track disease activity and assess treatment response.
- Electromyography (EMG): This test measures electrical activity in muscles and can help evaluate muscle function and identify any abnormalities.
- Pulmonary function tests: These tests assess lung function and can help determine if there is any involvement of the respiratory system.
Remember, these examinations, tests, and procedures should be discussed with your healthcare provider as they can tailor them to your individual situation.
The goals of treatment for dermatomyositis are to manage specific symptoms and address any complications that may arise. Here are the different types of treatments and how they work to achieve these goals:
Medications:
- Glucocorticoids: These drugs help reduce inflammation and suppress the immune response.
- Immunosuppressive medications: Methotrexate and azathioprine are examples of drugs that can be used in combination with glucocorticoids to further suppress the immune system.
- Intravenous immunoglobulin (IVIG): This treatment involves administering blood products directly into the bloodstream to boost the immune system.
- Hydroxychloroquine: A commonly used medication for patients with dermatomyositis. However, some studies have linked the drug use to increased risk of negative skin reactions among patients that receive Hydroxychloroquine treatment
Therapies:
- Physical therapy: This therapy improves muscle strength and helps stops muscles from tightening or becoming stiff.
- Heat and cold therapy: Applying heat can reduce muscle stiffness by increasing blood flow, while ice can help ease pain and inflammation
- Complementary therapies: Massage, acupressure, and chiropractic therapies can help reduce pain and promote muscle relaxation
- Speech therapy: It helps manage swallowing and speech difficulties that may occur.
Surgical procedures:
- Calcification surgery: Surgical procedures can remove infected or painful calcium buildup.
It's important to note that these treatments aim to reduce inflammation, manage symptoms, and prevent further disability. However, there is currently no cure for Dermatomyositis, so lifelong treatment is necessary. Always consult with your healthcare professional for personalized advice regarding medication dosing or potential side effects.