Sclerotic Regressing Large Congenital Nevus

Area of Science:

• Dermatology
• Pathology

Background:

• Congenital melanocytic nevi (CMN) are common benign melanocytic tumors present at birth.
• Regression of CMN typically involves pigmentary changes or halo formation.
• Rarely, CMN regression presents with sclerosis and alopecia.

Observation:

• A rare case of a large congenital melanocytic nevus with sclerotic and hypopigmented features is presented.
• The nevus exhibited characteristics suggestive of a localized scleroderma-like reaction.
• Evidence indicated the regression process initiated in utero and continued into early childhood.

Findings:

• The observed regression pattern in this congenital melanocytic nevus was atypical, characterized by sclerosis and hypopigmentation.
• The sclerotic changes resembled those seen in localized scleroderma.
• The regression appeared to have a prenatal onset and postnatal progression.

Implications:

• This case expands the understanding of the varied regression patterns in congenital melanocytic nevi.
• It suggests a potential link between sclerotic reactions and CMN regression, possibly mimicking autoimmune processes.
• Further research is warranted to elucidate the mechanisms underlying this rare presentation and its management.