Dermatomyositis (DM) A rash usually accompanies or precedes the muscle weakness in DM. in 1975 a set of five criteria were established to aid in the diagnosis of the disease: progressive proximal symmetrical muscle weakness, elevated muscle enzymes, abnormality on an electromyogram (EMG), abnormal muscle biopsy, and cutaneous skin disease.
Symptoms:
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![]() High magnification micrograph of dermatomyositis from a H&E stain of a muscle biopsy. Image by Nephron ![]() Gottron's papules in dermatomyositis. Discrete erythematous papules. Photos above & below from E. M. Dugan, A. M. Huber, F. W. Miller, L. G. Rider ![]() Heliotrope. Confluent macular erythema confined to the upper eyelid, with associated periorbital edema. ![]() Heliotrope. Confluent macular erythema - upper & lower eyelid, with associated periorbital edema. |