What is the primary difference in harm caused by external contact versus internal consumption of cantharidin?

Answer

External contact causes localized epidermal blistering, while ingestion causes systemic poisoning.

External contact with cantharidin acts as a vesicant, causing blisters, whereas ingestion leads to systemic poisoning affecting internal organs like the gastrointestinal tract, kidneys, and bladder.

What is the primary difference in harm caused by external contact versus internal consumption of cantharidin?
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