Search Results for: itch-scratch sequence

Histologic Diagnosis of Inflammatory Skin Diseases

Bacillary angiomatosis and Cat-scratch disease

…llergic rhinitis and conjunctivitis, and allergic asthma. Intense pruritus induces patients to rub the skin intensely and to scratch furiously, the resultant factitious lesions being erythematous, often scaly, macules, patches, papules, and plaques…

A Clinical Atlas of 101 Common Skin Diseases

Preface

…opathologic findings of the disease and serve as a vehicle to accomplish correlation with the gross findings. Thereafter, in sequence, is a schema just like the one a clinician should employ in examining an actual patient with a skin disease—namely,…

A Clinical Atlas of 101 Common Skin Diseases

Alopecias

Loss of hair attributable either to the effects of inflammatory cells on follicles or to physiological or mechanical factors in which inflammatory cells play no role. Although the scalp is the site most often affected, any region of the skin that…

A Clinical Atlas of 101 Common Skin Diseases

Melanoma

A malignant neoplasm of melanocytes that, in the skin, begins as a macule and may become a patch or a papule. A flat lesion of melanoma tends to be asymmetrical, poorly circumscribed with a scalloped, jagged, or notched border, and variegate,…

A Clinical Atlas of 101 Common Skin Diseases

Livedo Vasculitis and Livedo Reticularis

A type of small-vessel vasculitis (venulitis) of the skin, occurring especially in the vicinity of the ankle, characterized at first by purpuric macules and patches that, in time, may become hemorrhagic blisters that ulcerate and heal with white,…

A Clinical Atlas of 101 Common Skin Diseases

Atypical Mycobacterial Infections

Infection of skin and subcutaneous tissue by atypical mycobacteria, that is, mycobacteria other than those responsible for tuberculosis and leprosy, expressed clinically as keratotic and crusted papules, plaques, nodules, and tumors that may be…

A Clinical Atlas of 101 Common Skin Diseases

Kaposi’s Sarcoma

A systemic disease, which manifests itself in the skin first as violaceous macules and patches that tend to progress to papules and plaques, and sometimes to nodules and tumors, all of which represent hyperplasia of endothelial cells.

A Clinical Atlas of 101 Common Skin Diseases

Psoriasis

Psoriasis is a chronic, immune-mediated polygenic skin disorder affecting approximately 2% of the population. The pathogenesis of psoriasis features an interplay between adaptive and innate immunity centered on interleukin 23 and T-helper 17 cells…

A Clinical Atlas of 101 Common Skin Diseases

Lupus Erythematosus

Lupus erythematosus (LE) is a multisystem autoimmune connective tissue disease that can have protean effects on the skin. In some patients only the skin is involved, while in others, life-threatening internal complications can arise, ranging from…

A Clinical Atlas of 101 Common Skin Diseases

Porphyria Cutanea Tarda

…es of trauma, especially the face and dorsa of the hands, often in conjunction with macular hyperpigmentation and hypertrichosis of a face and sclerodermoid changes on a chest. The cutaneous manifestations are a consequence of enzymatic defects in…