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Diagnosis is suspected based on the appearance of the skin lesions, and strengthened by a prior history of chickenpox or shingles. It can be confused with herpes simplex.
Tests are rarely necessary, but may include:
- Viral culture of skin lesion
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Tzanck test of skin lesion
- Complete blood count (CBC) may show elevated white blood cells, a nonspecific sign of infection
- Specific antibody (immunoglobulin) measurement demonstrates elevation of varicella antibodies
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