'Dangal' star Suhani Bhatnagar, who essayed the role of young Babita Phogat, died at the age of 19 in Delhi on Friday. The actor was battling a rare disease called Dermatomyositis. Suhani Bhatnagar's family shared that while her symptoms appeared two months ago, she was diagnosed with the disease only ten days back. But what exactly is Dermatomyositis? Are you at risk? Watch the video to know everything about Dermatomyositis.