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Diagnostic Approach to Rash in Young Adults

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Diagnostic Approach to Rash in Young Adults

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Questions and Answers

What is the primary focus of the differential diagnosis of a rash in a young adult?

Distribution of the lesions

Global reaction pattern

Morphology of the lesion (correct)

Size of the lesion

What is the definition of a primary lesion?

An initial lesion that has not been altered by trauma or manipulation, and has not regressed (correct)

A lesion that has been altered by trauma or manipulation

A lesion that contains pus

A lesion that has regressed

What is a bulla?

A circumscribed, nonpalpable discolouration of the skin

A circumscribed, elevated lesion that measures ≥ 1 cm and contains serous or hemorrhagic fluid (correct)

A lesion that contains pus

A small, elevated lesion

What is the difference between a primary and secondary lesion?

Primary lesion is the initial lesion, secondary lesion develops as the disease evolves Signup and view all the answers

What is the term for the overall pattern of the skin's response to a rash?

Global reaction pattern Signup and view all the answers

What is a macule?

A circumscribed, nonpalpable discolouration of the skin that measures ≥ 0.3 cm Signup and view all the answers

What is a vesicle?

A circumscribed, elevated lesion that measures < 1 cm and contains serous fluid Signup and view all the answers

What is the correct order of steps in constructing a differential diagnosis for a rash in a young adult?

Morphology of the lesion, global reaction pattern, distribution of lesions Signup and view all the answers

What is the definition of a rash?

An inflammatory skin eruption Signup and view all the answers

Study Notes

Differential Diagnosis of a Rash in a Young Adult

A rash is an inflammatory skin eruption.
Differential diagnosis of a rash is primarily based on the morphology of the lesion.

Primary and Secondary Lesions

Primary lesion: the initial lesion that has not been altered by trauma or manipulation and has not regressed.
Secondary lesion: develops as the disease evolves or as the patient damages the lesion (e.g., rubbing, scratching, infections).

Types of Primary Lesions

Bulla: a circumscribed, elevated lesion that measures ≥ 1 cm and contains serous or hemorrhagic fluid (i.e., a large blister).
Macule: a circumscribed, nonpalpable discoloration of the skin that measures ≤ 0.3 cm.
Pustule: a lesion that contains pus; may be follicular (centered around a hair follicle) or nonfollicular.
Vesicle: a circumscribed, elevated lesion that measures < 1 cm.

Steps in Constructing a Differential Diagnosis

Identify the primary lesion, which is the typical element of the eruption.
Determine the global reaction pattern.
Note the distribution of the lesions (e.g., diffuse, isolated, localized, regional, universal).

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Description

Learn to diagnose rashes in young adults using a systematic approach, differentiating between primary and secondary lesions, and applying the ABCDE criteria for detecting melanoma.