Table 4.

Comparison of trichoscopic clues for the diagnosis of dermatomyositis, systemic lupus erythematosus, and systemic sclerosis

Trichoscopic findings	DM	SLE	SSc
Hair shaft findings	Decreased hair density and diameter	Prominent hair shaft hypopigmentationa Decreased hair density and diameter	Decreased hair density and diameter
Scalp surface findings	Perifollicular red-brown pigmentation3 Blue-gray speckled pigmentation Prominent perifollicular scales Prominent interfollicular scales	Brown scattered pigmentationa Blue-gray speckled pigmentation	White patchesa
Vascular findings	Microaneurysmal blood vesselsa Thick arborizing vessels Perifollicular location of aberrant vessels	Prominent arborizing blood vessels Thick arborizing vessels Interfollicular location of aberrant vessels	Polymorphic vessels forming a telangiectatic networka Avascular areaa Thick arborizing vessels
Features related to higher disease activity	Perifollicular red-brown pigmentation	Decreased hair diameter	Absence of thin arborizing vessels

DM, dermatomyositis; SLE, systemic lupus erythematosus; SSc, systemic sclerosis.

^aThe most specific sign in differentiating from the others.