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Bites in which envenomation does occur are usually painless and may not even be noticed when contact is made.
en.wikipedia.org The most common symptom is painless swelling in lymph nodes.
en.wikipedia.org Clinically, venom of this snake does not usually cause local effects at the bite site and is usually painless.
en.wikipedia.org It causes distortion of surrounding areas but is a usually painless growth, at least initially.
en.wikipedia.org Emergence of a painless lump that expands rapidly, especially among persons over age 50 or persons with immunosuppression, warrants examination by a physician.
en.wikipedia.org