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Differential diagnosis

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

These include:

  • variegate porphyria
  • hepatoerythropoietic porphyria
  • scleroderma
  • pellagra
  • polymorphous light eruptions
  • bullous erosive conditions:
    • pemphigus
    • pemphigoid
    • dermatitis herpetiformis
    • epidermolysis bullosa

Careful examination of porphyrins in urine (markedly increased uroporphyrin), stool (slighty increased coproporphyrin) and plasma (increased protoporphyrin) will almost always permit confirmation of PCT.


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