Unknown: Papules on the knees. Elastosis perforans serpiginosa (EPS)

Area of Science:

• Dermatology
• Genetics
• Connective Tissue Diseases

Background:

• Elastosis perforans serpiginosa (EPS) is a rare skin disorder characterized by transepidermal elimination of abnormal elastic tissue.
• EPS is frequently associated with various inherited connective tissue disorders, including Down syndrome.
• Typical clinical presentation involves umbilicated papules in a serpiginous pattern, often on the neck.

Observation:

• A 12-year-old female with Down syndrome presented with a localized form of EPS.
• The lesions were exclusively distributed on the extremities, deviating from the common neck presentation.
• The patient's condition exhibited an unusual spontaneous resolution following a diagnostic biopsy, without any therapeutic intervention.

Findings:

• The case highlights a localized, extremity-predominant manifestation of EPS in a patient with Down syndrome.
• The spontaneous resolution post-biopsy suggests a potential, albeit unconfirmed, role of the procedure or a unique disease course.
• This presentation challenges the typical understanding of EPS distribution and progression.

Implications:

• This case broadens the spectrum of clinical presentations for Elastosis perforans serpiginosa, particularly in individuals with Down syndrome.
• The spontaneous resolution offers insights into the variable natural history of EPS and potential triggers or resolution factors.
• Further research may elucidate the specific mechanisms underlying localized EPS and its response to interventions like biopsy.