Prurigo

Pruriga are strongly itchy diseases, mainly chronic, in which hard papules („seropapules“), are formed, caused by edema of the corium – so-called pruriginous nodules. With longer duration, lichenification of the skin occurs.

Prurigo simplex acute (Strophulus infantum)
Occasional sudden eruptions on the trunk and limbs, nodules the size of a pinhead to a lens, a blister forms in the top, excoriation → crust of dried blood. Sometimes they impetiginize. After healing, minor de- and hyperpigmentation occurs. Sometimes it appears as a food allergy other times after a flea bite varicella (doesn't itch) and scabies need to be differentiated in terms of differential diagnosis.

Prurigo simplex subacute (Prurigo temporanea, adultorum)
Similar, in adults, especially middle-aged women, predilection on extensor surfaces. For many months or years, small seropapules appear, persistently itch, soon scratch off and a (de)pigmented spot develops. The causes can be different, sometimes during pregnancy (prurigo gestationis), sometimes with GIT disorders, liver diseases, allergies.

Prurigo nodularis Hyde
Hard, warty-looking papules persisting for years on the limbs, persistently itchy, cause unknown.

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