Are there reports of aplasia cutis congenita lesions changing or developing scabbing later in childhood?

Aplasia Cutis Congenita Lesion Evolution in Childhood

The provided evidence does not contain reports of aplasia cutis congenita (ACC) lesions changing or developing scabbing later in childhood—the condition presents at birth and follows a predictable healing pattern without late-onset changes.

Natural History of ACC Lesions

ACC lesions are present at birth and represent congenital scarring, not evolving wounds that change in later childhood. 1, 2

Initial Presentation and Healing

• ACC manifests as a congenital absence of skin, most commonly on the scalp vertex (96.4% of cases) 3
• Lesions range from 0.5-3 cm typically, though larger defects occur 4
• Initial appearance varies: erythematous ulcerated areas, scar-like lesions, or full-thickness defects 5, 3
• Superficial lesions may heal spontaneously within the first months of life 6, 5

Histopathologic Characteristics

• ACC represents a congenital scarring alopecia with permanent loss of skin appendages from birth 1
• Histologically resembles deep-reaching scars with almost complete loss of adnexal structures 1, 2
• Elastic fibers are fragmented at birth and increase in thickness/density over time, but no new hair follicles or skin appendages develop 1
• Only isolated residual hair follicles (8/10 cases) and sweat glands (2/10 cases) may be present 1

Age-Related Changes

The only documented age-related changes in ACC are increased elastic fiber density and potential skull defect closure—not new scabbing or lesion transformation. 1

What Changes Over Time:

• Elastic fiber thickness and density increase with age 1
• Underlying skull defects may gradually decrease in size (e.g., from 7x10 cm to 1.2x1.2 cm over 4.5 years) 6
• Residual findings include atrophic scarring, milia, and nail dystrophies at sites of aplasia cutis 7

What Does NOT Change:

• No gain of adnexal structures (hair follicles, sweat glands) occurs with increasing age 1
• The scar-like appearance is permanent 2
• No reports exist of late-onset scabbing or lesion transformation in childhood 1, 2

Important Clinical Distinctions

Conditions That May Be Confused with ACC:

• Atretic parieto-occipital encephalocele: Can mimic ACC but has underlying bony defect and venous anomalies on neuroimaging 8
• Bullous dermolysis of the newborn (BDN): May present with aplasia cutis of lower extremities but shows rapid improvement with cessation of blister formation by 3 months 7
• Infantile hemangiomas: These are vascular lesions that can ulcerate and scab during proliferative phase (up to 12 months), but are distinct from ACC 8

Clinical Implications

If a lesion initially diagnosed as ACC develops new scabbing or changes in later childhood, reconsider the diagnosis. True ACC lesions are static scars from birth that do not develop new ulceration or scabbing beyond the initial neonatal healing period. 1, 2

Red Flags Suggesting Alternative Diagnosis:

• New ulceration or scabbing after initial healing
• Progressive changes beyond the first few months of life
• Development of blistering in previously healed areas (consider BDN) 7
• Associated with ongoing skin fragility (consider epidermolysis bullosa subtypes) 7