Blue nevi are benign melanocytic lesions located in the deeper reticular dermis,
consequence of failure of melanocytic migration into the dermal-epidermal
junction from the neural crest. Lesions are usually asymptomatic and solitary,
but may present in a multiple or agminated (grouped) pattern. The agminated
subtype is formed when bluish-pigmented lesions cluster together in a
well-defined area. Lesions can be flat or raised. We report the case of a
patient who presented multiple bluish macules (1-3 mm in diameter) grouped on
the left upper back. Dermoscopy and anatomic pathological examination were
consistent with blue nevus.
Gianotti-Crosti syndrome is a rare disease characterized by acral papular
eruption with symmetrical distribution. It is a benign and self-limited disease;
the symptoms disappear after two to eight weeks, without recurrences or scars.
Skin lesions are usually asymptomatic. Prodrome might occur, suggesting upper
respiratory infection, or constitutional symptoms. Diagnosis is eminently
clinical, and this disease is associated with viral infections. Due to its
rarity and low occurrence in adolescents and adults, we report a case of
Gianotti-Crosti syndrome of a teenager.
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