A pigmented lesion on a shoulder

A 48-year-old man consulted for this pigmented lesion on his right shoulder.

Dermoscopy revealed:

• an atypical reticular pattern
• structureless areas with regression
• a retiform depigmentation (negative pigment network)

Pathology was in favor of a melanoma in situ.

Back lesion

A 65-year-old man with many pigmented lesions on his back. One of this lesion was atypical.

Dermoscopy revealed:

• multiple colors
• an atypical reticular network
• regression
• a reticular depigmentation  (rectangle)

Pathology revealed a melanoma in situ.

Acquired lesion on an ankle.

A 26-year-old man consulted for an acquired lesion for 4 years which was slowly enlarging on his right ankle.

 Clinical picture.

 Dermoscopic picture without pressure.

Dermoscopic picture with pressure.

This regular lesion has:

• regular dotted vessels
• a retiform depigmentation, or reticular depigmentation  

Clinical and dermoscopic patterns were in favor of a Spitz nevus.

Pathology confirmed this diagnosis.

Spitz nevus

A 32-year-old woman consulted for this pigmented lesion on her left wrist. The lesion was excised. Pathology revealed a combined Spitz nevus.

Dermoscopy showed a negative pigment network also called retiform depigmentation