Macular lesion on a leg.

A 42-year-old woman consulted for this lesion localized on her left leg.

Dermoscopic evaluation revealed sharply focused elongated and serpentine telangiectasias on an whitish-yellowish structureless area in favor of a necrobiosis lipoidica.

A biopsy confirmed diagnosis.

Reference: Dermoscopy of necrobiosis lipodoidica and granuloma annulare. R. Pellican and al. Dermatology 2013; 226: 319-23

ground

Fast growing tumor

A 65-year-woman consulted for this lesion on her left arm which was present for 3 months.

Dermoscopy revealed peripheral hairpin-like vessels on a whitish area, and a central brownish structureless area.

This lesion was excised and pathology revealed a kératoacanthoma.

Clear cell hidradenoma

Fig 1: clinical picture

A 52-year-old man consulted for a scapular nodule. Clinical examination revealed a flesh-coloured nodule (Fig 1)

Fig 2 dotted vessels

Polarizing dermoscopy with a slight pressure revealed dotted vessels (Fig 2)

Fig 3 whitish areas

Fig 4 whitish areas

Dermoscopy with a louder pressure revealed whitish areas (Fig 3 and 4).

This lesion was excised and pathology revealed a clear cell hidradenoma.

Clear cell hidradenomas are usually benign intradermal tumors and represent 95% of all hidradenomas. These tumors have a slow growth and sometimes can be ulcerated. Theay have to be surgically excised because of a high risk of recurrence and a potential of malignant evolution.

Y. Yoshida and al. reported dermoscopic features of a clear cell hidradenoma (Y. Yoshida and al. Dermatology 2008;217: 250-251).

They found in their case whitish areas, reddish purple areas, and some linear or hairpin vessels on the surface of the tumour. Reddish purple areas were corresponding to cystic spaces with hemorrhage.