Differential Diagnosis in Dermatopathology

Lichen planus vs. Lichen planus-like keratosis

Papules on skin and mucous membranes that result from infection of keratinocytes by different types of papillomavirus and classified according to their silhouettes, to wit, papillated (verrucae vulgares on different sites such as volar skin, i.e., v…

Differential Diagnosis in Dermatopathology

Allergic contact dermatitis vs. Irritant contact dermatitis

Papules on skin and mucous membranes that result from infection of keratinocytes by different types of papillomavirus and classified according to their silhouettes, to wit, papillated (verrucae vulgares on different sites such as volar skin, i.e., v…

Differential Diagnosis in Dermatopathology

Lichen amyloidosis vs. Colloid milium

Papules on skin and mucous membranes that result from infection of keratinocytes by different types of papillomavirus and classified according to their silhouettes, to wit, papillated (verrucae vulgares on different sites such as volar skin, i.e., v…

Differential Diagnosis in Dermatopathology

Discussions

…by extravasated erythrocytes at the tip of digitations, focal hypergranulosis, dilated tortuous capillaries in thin dermal papillae, collarettes of epithelium at the periphery of a lesion, some abnormal nuclei, an increased number of mitotic figures,…

Histologic Diagnosis of Inflammatory Skin Diseases

Psoriasis

…qual lengths Suprapapillary plates thin slightly Wedge-shaped hypergranulosis, especially in infundibula Compact orthokeratosis Correlation clinicopathologic Papules of psoriasis are smooth when mounds of parakeratosis are covered by the original co…

Differential Diagnosis in Dermatopathology

Lichen simplex chronicus vs. Hypertrophic lichen planus

Papules on skin and mucous membranes that result from infection of keratinocytes by different types of papillomavirus and classified according to their silhouettes, to wit, papillated (verrucae vulgares on different sites such as volar skin, i.e., v…

Differential Diagnosis in Dermatopathology

Nevus verrucosus vs. Acanthosis nigricans

Papules on skin and mucous membranes that result from infection of keratinocytes by different types of papillomavirus and classified according to their silhouettes, to wit, papillated (verrucae vulgares on different sites such as volar skin, i.e., v…

Differential Diagnosis in Dermatopathology

Alopecia areata vs. Trichotillomania

Papules on skin and mucous membranes that result from infection of keratinocytes by different types of papillomavirus and classified according to their silhouettes, to wit, papillated (verrucae vulgares on different sites such as volar skin, i.e., v…

Differential Diagnosis in Dermatopathology

Ichthyosis vulgaris vs. X-linked ichthyosis

Papules on skin and mucous membranes that result from infection of keratinocytes by different types of papillomavirus and classified according to their silhouettes, to wit, papillated (verrucae vulgares on different sites such as volar skin, i.e., v…