Psoriasis can start at almost any age and involves both the sexes equally. It manifests in a variety of forms.
The most frequent manifestation is called plaque type psoriasis where the lesions characteristically consist of well demarcated erythematous plaques covered with loosely adherent silvery scales, the silvery colour of the scales becoming more prominent when attempts are made to scrape them off.
The lesions vary in shape and size and with peripheral extension some lesions may coalesce to form large gyrate or geographical patterns. Extensor aspects of the extremities, particularly the elbows and the knees, the sacral region of the back and the scalp are the usual sites. Scalp involvement is rare in children. [Read more...]
This is a group of disorders in which there is complete absence of melanin pigmentation in the skin and eyes. If the defect is in eyes and skin both it is known as oculo-cutaneous albinism. If it is in the eyes alon, it is caled ocular albinism. There are ten types of OCA and 4 types of OA.
Pityriasis rosea is an acute, self-limiting skin eruption with a distinctive and constant course, with an initial lesions that is a primary plaque that is followed after 1 or 2 weeks by a generalized secondary rash with a typical distribution and lasting for about 6 weeks
This is the commonest allergic dermatosis and manifests as sudden eruptions of itchy wheals, which may vary in size and shape from very small circular lesions to very large irregular areas.
