Rodolfo Suárez

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Reflectance confocal microscopy patterns and structures of clinically dark lesions are described. Because many of the dark lesions have melanin in superficial skin layers these lesions show great semiology by confocal. Limitations and pitfalls of reflectance confocal microscopy in clinically dark lesions are also detailed.
In this paper we study a kind of even degree polynomials of a special form. Necessary and sufficient conditions are given in order to decide if such polynomials have all their roots on the unit circle. Next, we apply these results to obtain sufficient conditions to have the Schur stability of a segment of polynomials.