Cutaneous Manifestations and Their Corresponding Dermoscopic Features in Patients with Dermatomyositis

Area of Science:

• Dermatology
• Rheumatology
• Medical Imaging

Background:

• Dermoscopy is a noninvasive magnification technique for skin evaluation.
• Its use in inflammatory skin conditions and connective tissue diseases is growing.
• Currently, dermoscopy in connective tissue diseases is primarily used as a nailfold capillaroscopy substitute.

Purpose of the Study:

• To expand the use of dermoscopy in patients with dermatomyositis (DM) beyond nailfold examinations.
• To establish a clinico-dermoscopic correlation between clinical signs and dermoscopic features in DM skin lesions.

Main Methods:

• A prospective study involving 29 patients with DM over 3 years.
• Dermoscopy was performed using a DermLite DL1 dermatoscope and camera.
• Examined lesions included periungual, scalp, Gottron papules, palmar papules, poikiloderma, and auricular changes.

Main Results:

• Dermoscopy revealed advanced nail fold capillary changes: giant capillaries (79%), microhemorrhages (46%), and avascular areas (25%).
• Scalp examination showed enlarged tortuous capillaries (64%), interfollicular scales (50%), and peripilar casts/tufting (36%).
• Other findings included Gottron papules (20 patients), poikiloderma (11), palmar papules (4), and auricular lesions (4).

Conclusions:

• Dermoscopy enhances diagnostic accuracy for skin lesions in dermatomyositis.
• The study elucidates previously poorly understood characteristics of DM skin manifestations through dermoscopy.