Hypopigmented macular amyloidosis with or without hyperpigmentation

Area of Science:

• Dermatology
• Pathology

Background:

• Primary cutaneous amyloidosis (PCA) is a group of disorders characterized by amyloid deposition in the skin.
• Typical PCA presents with pruritus and hyperpigmentation.

Observation:

• Three adult-onset cases of PCA were observed.
• These cases predominantly featured hypopigmentation, with or without reticular hyperpigmentation.
• Pruritus was notably absent in all observed cases.

Findings:

• The observed cases exhibited amyloid deposition in the dermal papillae, consistent with PCA.
• However, the clinical presentation deviated significantly from typical PCA features.
• The predominant hypopigmentation and lack of pruritus are distinguishing characteristics.

Implications:

• These findings suggest that PCA may have a broader clinical spectrum than previously recognized.
• Clinicians should consider atypical presentations, including hypopigmentation and absence of itching, in diagnosing PCA.
• Further research is needed to understand the pathogenesis of these variant PCA forms.