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Which of the following diagnostic criteria is essential for confirming the diagnosis of psoriasis?

A.

Positive skin biopsy showing eosinophils infiltration

B.

Family history of autoimmune diseases

C.

Presence of at least 3 typical psoriasis plaques on the body

D.

Elevated erythrocyte sedimentation rate (ESR) on blood test

Answer and Explanation

The Correct Answer is C

Explanation: The presence of at least 3 typical psoriasis plaques on the body is one of the essential diagnostic criteria for confirming psoriasis. These plaques are characterized by well-defined, erythematous (red), raised lesions with silvery-white scales.

Incorrect choices: a. Positive skin biopsy showing eosinophils infiltration: While a skin biopsy may be performed to support the diagnosis of psoriasis, the presence of eosinophils is not specific to psoriasis and can be found in various skin conditions.

b. Family history of autoimmune diseases: A family history of autoimmune diseases may increase the risk of developing psoriasis, but it is not a definitive diagnostic criterion for the condition.

d. Elevated erythrocyte sedimentation rate (ESR) on blood test: An elevated ESR can indicate inflammation in the body, but it is not specific to psoriasis and may be present in other inflammatory conditions as well.


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Related Questions

Correct Answer is C

Explanation

Explanation: The typical clinical manifestations of psoriasis include red, raised, and scaly patches on the skin. These patches are often itchy and may be associated with discomfort.

Incorrect choices: a. Purulent discharge is not a characteristic feature of psoriasis. Psoriasis lesions typically do not contain pus.

b. Psoriasis lesions are not smooth and painless. They are raised and may be painful or itchy.

d. Ulcerated and bleeding skin sores are not typical of psoriasis. Psoriasis lesions are characterized by dry, scaly plaques rather than open sores.

Correct Answer is C

Explanation

Explanation: The primary etiological factor in psoriasis is a genetic predisposition. Psoriasis has a strong hereditary component, and individuals with a family history of the condition are at a higher risk of developing it. While environmental triggers can exacerbate psoriasis symptoms, the condition itself is primarily influenced by genetic factors.

Incorrect choices: a. Bacterial infection: Psoriasis is not caused by a bacterial infection. It is an autoimmune condition characterized by an overactive immune response, leading to inflammation and skin cell overproduction.

b. Fungal overgrowth: Fungal overgrowth is not a cause of psoriasis. Psoriasis is not related to fungal infections and has a different underlying mechanism.

d. Allergic reaction: While certain allergens may exacerbate psoriasis symptoms in some individuals, an allergic reaction is not the primary cause of psoriasis. The condition's pathophysiology is rooted in immune system dysfunction rather than allergic responses.

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