If it affects the blood vessels in the stomach or intestines, which is more common in juvenile DM, the people might vomit blood, have black tarry bowel movements, or may develop a hole somewhere in their GI tract.There are further complications possible with Dermatomyositis. These complications include difficulty swallowing due to the muscles in the esophagus being affected which can result in malnutrition and can cause the breathing of food or liquids, into the lungs. Examples of dermatomyositis

Causes
The cause is unknown, but it may result from an initial viral infection or cancer, either of which could raise an autoimmune response.Between 7 and 30% of dermatomyositis cases arise from cancer, probably as an autoimmune response. The most commonly associated cancers are ovarian cancer, breast cancer, and lung cancer. Between 18 and 25 per cent of people with amyopathic DM also have cancer. Malignancy in association with dermatomyositis is more prevalent after age 60. Some cases are inherited, and HLA subtypes HLA-DR3, HLA-DR52, and HLA-DR6 seem to create a disposition to autoimmune dermatomyositis.
applied topical calcipotriol to a patient with a successful result.As mentioned, various treatment methods are offered against EV; however, most importantly, education of the patient, early diagnosis, and excision of the tumoral lesions take preference to prevent the development of cutaneous tumors. Notable cases
Ion Toader
In March 2007, a Romanian man named Ion Toader was diagnosed with this condition. A patient of dermatologist Carmen Madeleine Curea, his pictures appeared on numerous blogs and Romanian press sources. Curea works with Spitalul Clinic Colentina in Bucharest, Romania. Stephen Stone, past president of the American Academy of Dermatology, confirmed that this was Lewandowsky–Lutz. Toader underwent surgery in late 2013, and since then has been mostly symptom-free, with only small reappearances. Dede Koswara
In November 2007, a video of a 35-year-old Indonesian man named Dede Koswara with a similar disease appeared on the Internet. His story appeared on the U.S. Discovery Channel and TLC series My Shocking Story (Extraordinary People on UKs Five) in the episode "Half Man Half Tree". On August 12, 2008, Koswaras story was the subject of an ABCs Medical Mystery episode entitled "Tree Man".On 26 August 2008, Koswara returned home following surgery to remove 6 kg (13 lb) of warts from his body. The surgery consisted of three steps:

Removal of the thick carpet of warts and massive horns on his hands
Removal of the smaller warts on his head, torso, and feet
Covering of the hands with grafted skinIn all, 96% of the warts were removed.