Disorder	Variants
Diffuse cutaneous systemic sclerosis	—
Limited cutaneous systemic sclerosis	CREST syndrome
Systemic sclerosis sine scleroderma	—
Localized scleroderma	Linear scleroderma
		En coup de saber
	Morphea
		Generalized
		Plaque
Mixed connective tissue disease	Features of systemic sclerosis, polymyositis, and SLE
Overlap syndromes	Systemic sclerosis plus polymyositis, rheumatoid arthritis, or SLE
Scleroderma mimics	Amyloidosis
	Chronic graft-versus-host disease
	Diffuse fasciitis with eosinophilia
	Eosinophilia-myalgia syndrome
	Nephrogenic fibrosing dermopathy
	Paraneoplastic syndromes
	Scleredema
	Scleromyxedema (papular mucinosis)
	Toxic oil syndrome
Undifferentiated connective tissue disease	Multiple nonspecific, serologic or clinical abnormalities that do not meet ACR criteria for rheumatic disease