Dermatoses figuradas

Em rede | Reticulada

  • Cutis Rhomboidalis Nuchae
    • Devido às pregas de flexão/extensão
 

Serpiginoso

  • Colisão de lesões anulares gradualmente a abrir
Larva Migrans, Currens, Loa Loa
  • Pili migrans (pelo ou cabelo na camada subcornea)

Geométrico

  • Reminescente da causa
    • Cicatrizes circunferenciais ou quadrangulares
  • Em estrela
    • Angioma stellate
  • Em árvore
    • Branched lividity
    • Striated lichenoid keratosis
 

Em halo

Sutton Halo Nevus
Fenómeno de Meyerson → halo de eczema em torno de uma lesão melanocítica ou não melanocítica
  • Corresponde a uma resposta de eczema a antigénios novos expostos em células epidermicas transformadas (ex. nevo, queratose actínica, etc.)
 

Dermatoses lineares

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Fatores exógenos
 
Sherrington’s line (axial lines)
  • Specific lines on the limbs that mark the boundary between dermatomes supplied by non-consecutive spinal nerves (e.g., a transition from C5 to C8).
  • Line A: anterior surface of the arm and pectoral region
  • Line B: inner thighs
  • Some vitiligo cases may follow these lines
  • Sometimes evident in morbilliform eruptions - “drug line”, due to differential pigmentary or inflammatory responses on either side of the line
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Fuchter-Voigt’s “demarcation” line
  • represent a remanent of embryology
  • Vertebrates have ventral face lighter pigmented than dorsal
  • Less pigmentation on the anterior-internal side of the arm compared to the posterior-external area → more visible in pigmented subjects
 
 
  • Wallace line
    • Forms the anatomical boundary between skin with dermatoglyphs and skin with normal anatomical structure
    • Between the palm and back of the hand, and the sole and back of the foot
    • Contribute to demarcation of acquire inflammatory dermatoses
    • Correspond the fact that lymphatic drainage is different on either side of these lines (different dorsal and ventral system)
    • Palmoplantar keratoderma can be Transgradient if extend beyond Wallace lines to dorsal suface of the hands and feet
 
Blaschko Lines
  • Traces of the migration of primordial ectoderm cells during embryogenesis
    • Queratinócitos derivam da ectoderme de superfície
    • Melanócitos derivam da crista neural
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  • Reflect genetic mosaicism: Invisible in healthy individuals, become visible if a dermatosis results in abnormaly mifgrated primordial clone
  • Isolated VS. Syndromic
    • More extensive = more likely systemic involvement
    • Early mutations can involve CNS, msk, ophtho, cardiac tissues
 
Flagellate dermatosis
  • Chemotherapy
    • Bleomycin (++)
        • Relative deficiency of bleomycin hydroxylase in the skin, which causes the product to accumulate in situ, resulting in local inflammation and subsequent pigmentary incontinence (controversial)
    • Taxanes
  • Shiitake Dermatitis (Flagellate Mushroom Dermatitis)
 

Annular dermatoses | Eryhtema Gyratum

Synonym: erythema gyratum
 
Mechanism:
  • Involves 2 elements
    • Spontaneous resolution (central healing)
      • Due to consumption and depletion of the factors necessary for the inflammatory reaction
    • Centrifugal progression into healthy skin
      • Progression of Infectious agents
      • Unknown in non-infectious agents
 
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Eritema Anular Secundário (há autores que consideram um padrão de reação)
  • Infeções: TB, apendicite, ascariasis, virus
  • Malignancy: Hodgkin, thrombocytopenia
  • Medications
 
Na tabela, falta o eritema anular do Sjogren