Psoriasis of the scalp

The scalp is frequently involved in patients with psoriasis vulgar is and rarely may be the only place affected. It looks like a crown erythematous to net margins covered with silvery scales white-dried, hair all attachment located in front-temporal, parietal-occipital or retroauricolare, (where often erythematous component is greater) and associated injuries scales -crostose from scratching. In front-temporal regions, particularly in young subjects, the spots spread over capillaries involving the skin of the face and auricle. In inveterate forms, following the confluence of several spots and the lack of evidence erythematous component, we reach the formation of a real cap that is the entire scalp. In other cases there are silvery-white scales dried on a widespread peeling pitiriasiforme dry furfuracea-like, sometimes with follicular evidence. The spots are not alopecizzanti and hair are not incorporated by heaps squamous. However, at minimum forms of psoriasis of the scalp may belong pseudotigna amiantacea, previously considered a variant of impetigo, characterized by the presence of small scales members all asbestos similar opaque white, which incorporate the proximal part of the hair shaft.
Sebopsoriasi
  Also savories or psoriasis seborroicae by some considered one associazionefra psoriasis and dermatitis seborroica. Since both psoriasis that dermatitis seborroica dermatosis are very common in the general population, is frequently found both in the same patient.
Clinically manifested by a rash dermatitis psoriasiforme-peeling scalp, fold-geniene nose and forehead.
The spots are characterized by a greasy look that usually lacking in typical psoriasis. This form is explained as the coneistenza a seborroico habit and a genetic predisposition to psoriasis.
The relationship between psoriasis and dermatitis seborroica have been studied since the time of Unna: the two dermatosis often appear clinically indistinguishable, especially when affecting the scalp (even histologically according to the German school, although North American authors (B. Ackerman) not agree with this concept unicistica), it is very likely that dermatitis seborroica can act as a "factor koebnerizzante" l.