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(Synonym: Xanthelasmoidea.)

Describe urticaria pigmentosa.

Urticaria pigmentosa is a rare disease, variously viewed as an unusual form of urticaria and as an urticaria-like eruption in which there is an element of new growth in the lesions. It begins usually in infancy or early childhood and continues for months or years, and is characterized by slightly, moderately, or intensely itchy, wheal-like elevations, which are more or less persistent and leave yellowish, orange-colored, greenish or brownish stains. Exceptionally subjective symptoms are almost entirely absent. Anatomical studies show that the lesion has in some respects the structure of an ordinary wheal, with œdema and pigment deposit in the epidermal portion, and cellular infiltration made up principally of mast-cells.

Fig. 13.

Urticaria Pigmentosa.

The nature of the disease is obscure and treatment unsatisfactory. Ordinarily as early youth or adult life is reached it spontaneously disappears. The treatment advised is usually on the same lines as that of chronic urticaria.