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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: Plaque psoriasis is the most common type of psoriasis, accounting for approximately 80-90% of all cases. It is characterized by the presence of raised, well-defined, erythematous (red) plaques with silvery-white scales.

Incorrect choices: a. Guttate psoriasis: Guttate psoriasis is characterized by small, teardrop-shaped lesions scattered on the skin, often following a streptococcal infection. It is less common than plaque psoriasis.

b. Inverse psoriasis: Inverse psoriasis affects skin folds, such as the armpits, groin, and under the breasts. It appears as smooth, red patches and is less common than plaque psoriasis.

d. Pustular psoriasis: Pustular psoriasis is a specific subtype characterized by pustules on the skin, but it is less common than plaque psoriasis.

Correct Answer is C

Explanation

Explanation: Psoriasis is not contagious and cannot be spread through direct contact with affected individuals. It is an autoimmune disease where the immune system mistakenly attacks healthy skin cells, leading to the characteristic red, scaly patches on the skin.

Incorrect choices: a. This statement is correct. Psoriasis is a chronic skin condition that causes red, scaly patches on the skin.

b. This statement is correct. Psoriasis is indeed an autoimmune disease where the body's immune system attacks healthy skin cells.

d. This statement is correct. Treatment for psoriasis aims to reduce inflammation and slow down the rapid skin cell growth to manage the symptoms of the condition.

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