Terra-firma forme dermatosis: Report of three cases

Terra-firma forme dermatosis (TFFD), also known as Duncan’s dirty dermatosis, is characterized by “dirt-like” brown-grey cutaneous patches and plaques. Abnormal and delayed keratinization has been implicated in its pathogenesis. The disorder is not well known by dermatologists even though affected patients present with typical dirt-like lesions. TFFD can be easily diagnosed and treated with 70% isopropyl alcohol. It is important to recognize this benign dermatologic entity because it can be easily confused with many other dermatological conditions. Hence, in order to avoid unnecessary referrals, laboratory investigations, skin biopsies, and medications, a trial of wiping the skin lesion with 70% isopropyl alcohol pads is suggested whenever the diagnosis of TFFD is considered. In this article, the author is reporting three new cases of TFFD.

Keywords: Delayed keratinization, Duncan’s dirty dermatosis, Terra-firma forme dermatosis, 70% isopropyl alcohol

Terra-firma forme dermatoz: Üç olgu bildirimi

Duncan’?n kirli dermatozu olarak da bilinen Terra-firma forme dermatoz (TFFD), kir benzeri kahverengi gri renkli plaklar ile karakterize bir klinik tablodur. Anormal ve gecikmi? keratinizasyon patogenezinde rol oynar. Hastal?kta, tipik kir benzeri lezyonlar olsada, ay?r?c? tan?da zorlan?labilir. TFFD’nin, %70 izopropil alkol ile silinerek giderilmesi tan? almas?n? ve tedavisini sa?lar. Bu benign dermatozun tan?nmas?, gereksiz hastane ba?vurular?n?n, laboratuvar ara?t?rmalar?, deri biyopsileri ve ilaç tedavilerinin önüne geçilmesi için önemlidir. Bu yaz?da yazar üç yeni TFFD olgusu bildirmektedir.

Anahtar Kelimeler: Gecikmi? keratinizasyon, Duncan’?n kirli dermatozu, Terra-firma forme dermatozis, %70 izopropil alkol