A blaschkolinear lesion in a patient with atopic dermatitis can be a superimposed segmental manifestation of this polygenic disorder. Knowledge of this phenomenon, presence of less severe, disseminated, symmetrically distributed lesions of the same disorder and, if necessary, histology are helpful in the differential diagnosis from other linear inflammatory diseases.

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Introduction Terra firma-forme dermatosis (TFFD) belongs to the group of “dirty dermatoses” and represents a not well-known and surely underestimated skin condition. Clinical Cases We present 2 cases of TFFD and present clinical and dermatoscopical findings. Results We present specific dermatoscopical findings of TFFD. Conclusion We propose the denomination “chromosome arms” sign for Terra firma-forme dermatosis