Primary cutaneous amyloidosis: identically distributed lesions in identical twins

Area of Science:

• Dermatology
• Genetics
• Pathology

Background:

• Lichen amyloidosus is a rare form of cutaneous amyloidosis.
• Familial cases of lichen amyloidosus have been reported, suggesting a genetic component.
• Congenital abnormalities can sometimes be associated with genetic skin disorders.

Observation:

• Identical male twins presented with lichen amyloidosus affecting similar chest and abdominal areas.
• Both twins exhibited nonpruritic lesions.
• The distribution pattern of the nonpruritic lesions was notably similar between the twins.

Findings:

• The identical distribution of nonpruritic lichen amyloidosus in HLA-identical twins supports a genetic predisposition.
• This presentation suggests a potential nevoid condition where specific keratinocytes undergo filamentous degeneration.
• The absence of pruritus in this familial pattern is a key distinguishing feature.

Implications:

• This case suggests a subset of lichen amyloidosus may originate from a nevoid anomaly.
• Understanding the genetic basis could lead to earlier diagnosis and management strategies for familial cutaneous amyloidosis.
• Further research into the molecular mechanisms of keratinocyte degeneration in this context is warranted.