Differential Diagnosis in Dermatopathology

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Lichenoid purpura (of Gougerot and Blum) Mycosis fungoides (plaque stage)…

Histologic Diagnosis of Inflammatory Skin Diseases

Lymphocytoma cutis

Lymphocytoma cutis Synonyms Pseudolymphoma Presentation stereotypical Age and sex Any age in both sexes Distribution of lesions Face and extremities especially Individual lesions Papules and nodules Course Weeks, months, and sometimes years; usually…

Differential Diagnosis in Dermatopathology

Lichen planus vs. Lichenoid discoid lupus erythematosus

An inflammatory process, but not a vasculitis, that involves the legs especially with purpuric macules and subtle papules (Schamberg’s disease), lichenoid papules (lichenoid purpura of Gougerot-Blum), and scaly papules (eczematid-like purpura

Histologic Diagnosis of Inflammatory Skin Diseases

Cytomegalic inclusion disease

Cytomegalic inclusion disease Synonyms Cytomegalovirus infection Cytomegalia Presentation stereotypical Age and sex Newborns or adults who are immunocompromised Distribution of lesions Localized, as in lesions in the perianal region of male homosexu…

Histologic Diagnosis of Inflammatory Skin Diseases

Lichen sclerosus et atrophicus

Lichen sclerosus et atrophicus Synonyms Lichen sclerosis Lichen alba White spot disease Presentation stereotypical Age and sex Any age, but most common in middle-aged women Distribution of lesions Genitalia particularly, but also other sites such as…

Dermatology Practical & Conceptual

What is your diagnosis? A solitary purple papule on the arm

The patient A 54-year-old woman with immune thrombocytopenic purpura (ITP) referred to our dermatology department with a three-week-history of a purple-colored lesion on her right arm. The patient was on treatment with oral prednisone at 20 mg/day f…