Wells' syndrome, insect bites, and eosinophils.

Area of Science:

• Dermatology
• Immunology
• Pathology

Background:

• Wells' syndrome is an idiopathic, recurrent inflammatory dermatosis linked to dysregulated tissue eosinophilia.
• Histological examination reveals flame figures, characterized by eosinophil-deposited major basic protein on collagen bundles.
• Flame figures are not exclusive to Wells' syndrome, leading to diagnostic ambiguity with the term 'eosinophilic cellulitis'.

Purpose of the Study:

• To clarify the characteristics and diagnostic considerations of Wells' syndrome.
• To differentiate Wells' syndrome from other conditions with eosinophilic infiltrates.
• To review potential triggers and associated conditions relevant to Wells' syndrome.

Main Methods:

• Review of clinical descriptions and histological findings associated with Wells' syndrome.
• Analysis of the diagnostic utility of flame figures.
• Consideration of differential diagnoses including parasitic infections, drug reactions, and other eosinophilic disorders.

Main Results:

• Wells' syndrome typically presents as a benign, self-remitting condition, though constitutional symptoms may occur.
• Flame figures are a key histological feature but lack specificity.
• Potential triggers include insect bites, infections (e.g., tinea), and drug reactions.
• Wells' syndrome can be associated with chronic urticaria or myeloproliferative diseases.

Conclusions:

• Accurate diagnosis of Wells' syndrome requires careful correlation of clinical and histological findings.
• The term 'eosinophilic cellulitis' is imprecise and should be used cautiously.
• Differential diagnosis must exclude other causes of eosinophilic dermatoses and consider potential precipitating factors.