Dermatomyositis — Clinical Case (Wikimedia Commons)

Diagnosis: Dermatomyositis

Dermatomyositis, Malar and facial erythema. Striking malar and facial erythema with facial edema and scale represents a recent disease flare in an adult patient with dermatomyositis. Confluent erythem. Clinical photograph sourced from Wikimedia Commons (CC BY-SA 3.0). Attribution: Elizabeth M Dugan, Adam M Huber, Frederick W Miller, Lisa G Rider.

Clinical Presentation

Heliotrope rash: violaceous erythema of upper eyelids with edema. Gottron papules: violaceous papules over MCPs, PIPs, elbows, knees. V-sign: erythema of anterior neck/chest. Shawl sign: posterior shoulders/upper back. Mechanic's hands: hyperkeratotic fissured fingertips.

Clinical History

Bimodal: childhood (5-15 years) and adult (40-60 years). Adults >40: screen for underlying malignancy (ovarian, breast, lung, GI — especially within 3 years of diagnosis). Proximal muscle weakness: difficulty climbing stairs, raising arms. Dysphagia may indicate esophageal involvement.

Treatment

Sun protection (photosensitive). Muscle disease: systemic corticosteroids + steroid-sparing agent (methotrexate, azathioprine, mycophenolate, IVIG). Skin: topical corticosteroids, antimalarials (hydroxychloroquine). Refractory: rituximab, IVIG. Malignancy screening essential.

Differential Diagnosis

Systemic lupus, Polymyositis, Contact dermatitis, Drug eruption, Psoriasis, Photosensitivity dermatitis

Key Learnings

Gottron papules are pathognomonic for dermatomyositis. Age-appropriate cancer screening is MANDATORY — CT chest/abdomen/pelvis, colonoscopy, mammography, pelvic exam. Myositis-specific antibodies guide prognosis: anti-Mi-2 (good), anti-MDA5 (ILD risk), anti-TIF1-γ (malignancy risk).

Tags: dermatomyositis, autoimmune, myopathy, connective tissue, paraneoplastic