Differential Diagnosis in Dermatopathology

Psoriasis on volar skin vs. Dyshidrotic dermatitis

An inflammatory process in which lesions present themselves clinically as red macules and subtle scaly papules. They soon become so confluent that there is widespread redness and scaling punctuated by islands of skin that ostensibly are spared and b…

Differential Diagnosis in Dermatopathology

Psoriasis vs. Pityriasis rubra pilaris

An inflammatory process in which lesions present themselves clinically as red macules and subtle scaly papules. They soon become so confluent that there is widespread redness and scaling punctuated by islands of skin that ostensibly are spared and b…

Differential Diagnosis in Dermatopathology

Guttate psoriasis vs. Seborrheic dermatitis

An inflammatory process in which lesions present themselves clinically as red macules and subtle scaly papules. They soon become so confluent that there is widespread redness and scaling punctuated by islands of skin that ostensibly are spared and b…

Differential Diagnosis in Dermatopathology

Psoriasis vs. Nummular dermatitis

An inflammatory process in which lesions present themselves clinically as red macules and subtle scaly papules. They soon become so confluent that there is widespread redness and scaling punctuated by islands of skin that ostensibly are spared and b…

Differential Diagnosis in Dermatopathology

Erythroderma of psoriasis vs. Erythroderma of mycosis fungoides

An inflammatory process in which lesions present themselves clinically as red macules and subtle scaly papules. They soon become so confluent that there is widespread redness and scaling punctuated by islands of skin that ostensibly are spared and b…

Differential Diagnosis in Dermatopathology

Guttate psoriasis vs. Guttate (dermatosis) parapsoriasis

An inflammatory process in which lesions present themselves clinically as red macules and subtle scaly papules. They soon become so confluent that there is widespread redness and scaling punctuated by islands of skin that ostensibly are spared and b…

Histologic Diagnosis of Inflammatory Skin Diseases

Psoriasis

An inflammatory process in which lesions present themselves clinically as red macules and subtle scaly papules. They soon become so confluent that there is widespread redness and scaling punctuated by islands of skin that ostensibly are spared and b…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…precede neutrophils in the epidermis of an incipient lesion of psoriasis, and they induce spongiosis there. The spongiotic character of psoriasis is appreciated best in lesions that develop on palms and soles. 10.90.4A: Perivascular dermatitis,…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Subcorneal Pustular Dermatosis?

…s are created at those same sites by eruptive scaly papules of psoriasis (guttate psoriasis) and by pustules of even more explosive lesions of psoriasis (pustular psoriasis). That should not be surprising, because pustular psoriasis represents dramat…

Histologic Diagnosis of Inflammatory Skin Diseases

Identification of Basic Patterns: Skin: Perivascular Dermatitis

…tually, however, the pattern of a lesion of eruptive (guttate) psoriasis (Fig. 5.109 A&B) is just as psoriasiform as that of a plaque of psoriasis, but for us in regard to purposes pedagogical, the guttate is not the stereotype of psoriasiform; a…