The rash that presents as target lesions

Area of Science:

• Dermatology
• Internal Medicine

Background:

• Target lesions are characteristic of severe mucocutaneous diseases.
• Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) are life-threatening conditions presenting with targetoid rashes.

Purpose of the Study:

• To systematically classify target lesions.
• To develop a diagnostic algorithm for differentiating SJS/TEN from other conditions presenting with targetoid lesions.

Main Methods:

• Clinical pattern analysis of target lesions.
• Classification based on lesion morphology (flat/raised, typical/atypical).
• Correlation with clinical features (fever, mucosal ulcerations, arthralgias) and systemic involvement.

Main Results:

• Detailed categorization of target lesions is presented.
• Specific clinical and histological features are associated with SJS/TEN.
• An algorithmic approach aids in diagnosis.

Conclusions:

• A structured approach to evaluating target lesions is crucial for timely SJS/TEN diagnosis.
• Differentiating SJS/TEN from benign conditions requires careful assessment of specific clinical and pathological findings.