Amyopathic Dermatomyositis

Amyopathic dermatomyositis (ADM) is dermatomyositis rash without clinically significant muscle weakness. Clinical: heliotrope rash, Gottron papules, shawl/V-sign, mechanic hands; normal/near-normal muscle enzymes. Diagnosis: rash pattern, normal CK, EMG/MRI/biopsy; myositis antibodies (anti-Mi-2, anti-MDA5, anti-TIF1-γ). Treatment: sun protection (SPF, clothing); topical corticosteroids/tacrolimus; hydroxychloroquine; methotrexate/azathioprine/IVIG if skin severe; monitor for conversion to classic DM and malignancy screening; follow-up dermatology/rheumatology.

Common Symptoms

Heliotrope rash; Gottron papules; photosensitivity; no weakness

Causes and Pathogenesis

Autoimmune microangiopathy limited to skin.

Treatment

Sun protection; topical steroids; hydroxychloroquine; monitor conversion

Preventive Measures

Sun protection; malignancy screening; vaccination.

Department to Visit

It is recommended to visit the Dermatology/Rheumatology department; an appointment can be booked on this platform before the visit.

Warm reminder: The above information is for health science reference only and cannot replace professional medical diagnosis. If you have related symptoms, please seek medical attention at a regular hospital promptly.