A Psoriatic pattern does not just apply to psoriasis. Most of the red scaly diseases will show some features of a Psoriatic pattern, particularly acanthosis (thickening of the epidermis) and hyperkeratosis ( thickening of the stratum corneum). Remember the red scaly diseases are the PMs PET so Psoriasis, some types of eczema with lichenification (scratch induced epidermal thickening) and Tinea, plus Pityriasis rosea, Pityriasis versicolor and Pityriasis rubra pilaris plus Mycosis fungoides and s for Solar damage (Solar keratoses, Bowen's disease) will all exhibit some features that we classify as psoriasiform!
