Cutaneous manifestations of dermatomyositis.
Psoriasiform scaly plaques of the scalp
|Red to violet poikilodermatous periorbital eruption with oedema. Figure 1A
Rash on the back and shoulders. Figure 1B
Rash on the anterior chest
|A raised violaceous rash at the knuckles of the hands, including the metatarsophalangeal and interphalangeal joints. Figure 1C
Erythematous or violaceous macules and patches overlying the extensor tendons of extremities, including over the elbows and knees.
Periorbital edema without skin colour change
|Combined hyper and hypopigmentation, telangiectasia, and superficial atrophy in the photoexposed skin on the upper portions of the chest and extensor surfaces of the arms
Lateral aspects of the hips and upper thighs with macular, violaceous erythema
Dystrophic calcinosis cutis
Cutaneous small vessel vasculitis
|Specific for JDM, seen in 70% cases, superficial or flesh coloured to white papules and nodules found on bony surfaces and potential inflammatory sites
Includes petechial macules, purpura, urticaria, livedo reticularis, and skin or oral ulceration
Follicular hyperkeratosis (Wong type DM), Erythema flagellatum, Panniculitis, Mucinosis, Erythroderma and oral mucosal changes
|Hyperkeratotic, scaly plaques on the radial and ulnar aspects of the thumb, index, and third fingers|
Inverse Gottron's papules
Digital pulp ulcerations
|White, atrophic or triangular hyperkeratotic palmar creases of the knuckles
Due to underlying vasculitis/vasculopathy
Lateral aspects of the upper arms with violaceous, macular erythema
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