Not true regarding Erythema toxicum neonatorum is

A. Usually occurs on the second or third day of life
B. More common on the soles or palm
C. Fever is usually absent
D. Eosinophils in the smears of the pustules are adequate to confirm the diagnosis

Erythema multiforme major is associated with

A. A preceding herpetic infection
B. Mycoplasma infection
C. Radiation therapy
D. Drug reactions

Iris lesion with central dusky purpura is seen in

A. Erythema multiforme minor
B. Erythema gyratum repens
C. Wells syndrome
D. Sweet syndrome

All of the following are gyrate erythemas except

A. Erythema marginatum of rheumatic fever
B. Erythema migrans of Lyme borreliosis
C. Granuloma annulare
D. Erythema gyratum repens

Not true of Wells syndrome is

A. Represent arthropod reactions
B. Typically recurrent
C. Individual episodes are short
D. Degranulation of dermal eosinophils produces the flame figures seen in histological sections.

All are features of erythema nodosum except

A. Erythema nodosum is the most common form of panniculitis
B. Lobular panniculitis is the characteristic feature
C. The most common identifiable causes are streptococcal infections
D. Erythema nodosum is generally a self-limited disease

In short

Sweet syndrome

Sweet syndrome is an acute febrile neutrophilic dermatosis. Four subtypes of Sweet syndrome have been described, based on their pathogenesis: the classic type (71%), cases associated with neoplasia (11%), cases associated with inflammatory disease (16%), and cases associated with pregnancy (2%).

Histologic Hallmark of Sweet syndrome

The histologic hallmark of Sweet syndrome is a nodular and diffuse dermal infiltrate of neutrophils with karyorrhexis and massive papillary dermal edema.

Marshall syndrome

The rare Marshall syndrome is characterized by skin lesions resembling Sweet syndrome, which are followed by acquired cutis laxa. Elastic tissue in
other organs may also be affected, especially the heart and lungs. Some cases may be associated with α1-antitrypsin deficiency.

Pyoderma gangrenosum

Pyoderma gangrenosum most typically occurs in adults age 40–60 and presents on the lower extremities and trunk. Lesions heal with characteristic thin, atrophic scars. Ulcerative form is more painful and destructive.

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