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Peeling Mole on Face: Warning Signs, Evaluation & When to Biopsy

Disclaimer: This is educational information, not medical advice. A peeling/changing mole requires in-person dermatologic evaluation.

Why Peeling/Change Matters

Moles (melanocytic nevi) are typically stable. Any change—peeling, scaling, crusting, bleeding, itching, growth, color shift—warrants examination. While many causes are benign (seborrheic keratosis, trauma, eczema, irritation), melanoma must be excluded.

ABCDE + EFG Criteria for Melanoma

  • A – Asymmetry: Halves don't match.
  • B – Border: Irregular, scalloped, poorly defined.
  • C – Color: Multiple shades (tan, brown, black, red, white, blue).
  • D – Diameter: > 6 mm (pencil eraser), but melanomas can be smaller.
  • E – Evolution: Most important. Any change in size, shape, color, elevation, symptoms (itch, bleed, peel).
  • F – Firmness: Harder than surrounding skin.
  • G – Growth: Progressive enlargement.

Benign Causes of Peeling/Flaking

  • Seborrheic keratosis ("stuck-on," waxy, verrucous surface)
  • Irritation / trauma (scratching, clothing, shaving)
  • Eczema / contact dermatitis on/near mole
  • Actinic keratosis (precancerous, rough scale)
  • Basal cell carcinoma (pearly, ulcerated, rolled borders – can mimic mole)

Diagnostic Steps

  1. Dermoscopy: Handheld polarized light microscopy. Reveals pigment network, globules, streaks, regression structures, vessels. Sensitivity/specificity >90% for melanoma.
  2. Biopsy: If suspicious.
    • Excisional biopsy (preferred): Full thickness, narrow margins (1–2 mm). Allows Breslow depth if melanoma.
    • Punch/Shave: Acceptable for small lesions if margins not compromised. Avoid shave if melanoma suspected (may transect).
  3. Pathology: Dermatopathologist evaluates. Melanoma diagnosis triggers staging (SLNB if ≥0.8 mm or ulcerated).

When to See a Dermatologist Promptly

  • Any changing mole (E in ABCDE)
  • New mole after age 30–35
  • "Ugly duckling" sign: lesion looks different from all your other moles
  • Personal/family history of melanoma, atypical nevi
  • Immunosuppression

Early melanoma (in situ / thin) = near 100% cure with excision. Delay costs lives.

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