Dermatomyositis: What's the disease that took the life of Dangal actress Suhani Bhatnagar?

Actress Suhani Bhatnagar, who played wrestler Babita's childhood in the Aamir Khan-starrer Dangal, passed away recently at the young age of 19. Speaking to the media, her parents said that she was affected by an autoimmune disease called dermatomyositis. Two months ago, the youngster started noting swelling in her hands, which later spread to the rest of her body. Though she was taken to many doctors, the diagnosis was not conclusive. It was only 12 days before her death that the real condition was diagnosed at the All Indian Institute of Medical Science (AIIMS), Delhi. She was admitted to All India Institute of Medical Sciences on February 7 and died on February 16 after medical complications. Here's what you should know about dermatomyositis:

What is dermatomyositis
According to the Mayo Clinic of the US,  "Dermatomyositis is an uncommon inflammatory disease marked by muscle weakness and a distinctive skin rash." The disease, which can affect both children and adults, affects more females than males. 

The cause behind the condition is unknown, though experts opine it can be an infection that affects people with a weak immune system. The disease can manifest in anyone, and it damages muscles so severely that you lose your ability to move. There is no known cure for the disease, though it is often treated with physiotherapy, exercise, rest and heat therapy.  

What are its symptoms?
Violet or dusky red-coloured rashes on the face, eyelids, back, chest, knees, elbows and knuckles are the common symptoms. They can be painful and extremely itchy. Those suffering from it can also experience weakness of muscles close to their hips, neck, upper arms, thighs and shoulders. They may also feel difficulty in swallowing and  breathing. Calcium deposits on skin, muscles and connective tissues are also seen in patients.