epidermal hyperplasia

See also : epidermal pseudoepitheliomatous hyperplasia

Types

 focal epidermal hyperplasia : epidermal hyperplastic lesions

• focal epidermal hyperplasia without cytonuclear atypias
  • pseudoepitheliomatous hyperplasia (PEH)

• focal epidermal hyperplasia with cytonuclear atypias
  • epidermal cellular dysplasia
    • pre-epitheliomatous keratosis

• • squamous cell carcinoma

 diffuse epidermal hyperplasia

• acanthosis

Images

 Epidermal hyperplasia over dermatofibroma can mimic seborrheic keratosis or Becker nevus on shave

• https://twitter.com/BenjaminAwood/status/818355883906187265

 22 yo female x 2 mo. Dx: giant molluscum contagiosum . epidermal hyperplasia with crater containing pretty molluscum bodies (Henderson–Patterson bodies). Giant molluscum may indicate underlying immunodeficiency.

• https://twitter.com/globaldermie/status/1151159744565874688

Etiology - Examples

 reactional epidermal hyperplasia

• UV light
• ionizing radiations

 virus-associated hyperplasia

• warts / warty lesions

 epidermal tumors

• cutaneous squamous cell carcinoma
  • in situ squamous cell carcinoma ( Bowen disease )
  • cutaneous invasive squamous cell carcinoma

 dermal tumors

• lymphagioma
• capillary hemangioma
• histiocytofibroma

Types

 regular epidermal hyperplasia
 dysplastic epidermal hyperplasia

See also

  epidermal anomalies
 follicular induction
 crateriform anomalies / crateriform lesions
 squamous cell epithelial hyperplasia