Systemic amyloidosis is a group of heterogeneous diseases caused by tissue deposition of misfolded proteins. We report 3 cases of patients with systemic amyloidosis. Diagnosis in all cases was confirmed by biopsy. Here, we also briefly review the pathogenesis, diagnosis, treatment, and clinical manifestations, with a particular focus on cutaneous manifestations. Since such lesions appear early in the disease, we consider that accurately identifying them can have an impact on the prognosis of this affection.