TERRA FIRMA FORME DERMATITIS
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Some years ago I read something about a dirty neck looking aspect of children
after solar exposure. I am not sure if the name of the disease was called by 
the authors something like "Terra firm forme dermatitis"
Does any one have an idea of what I am talking about? Any references?

Ramon Grimalt, MD, PhD
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Yes, the diagnosis of terra firma forme dermatitis is
made by the susceptibility of removal of the thickened
"dirty keratin" by the use of 70% isopropyl or ethanol
to remove the soap and water resistant crud.  Of course
the differential diagnosis includes acanthosis nigricans
and epidermal nevus.

Rhett Drugge, M.D.
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This entity was first (I think!) described by Christopher "Kit" Duncan while
at Baylor in the Dermatology Dept., where I trained.  I think he published it
in the early 80's, but for the life of me I can't remember the "official"
name he gave it.  Around our department it was always known as "Duncan's
Dirty Dermatosis".

Scott D. Clark M.D.
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