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Venomous spiders, in general, will not bite you unless they feel threatened or provoked. In Thailand, most spider bites are not considered to be harmful to humans. Very few spider bites result in victims requiring urgent medical attention or treatment.
Yellow Sac Spider
SEEK MEDICAL ATTENTION IMMEDIATELY IF BITTEN
Their bite is sharp and painful and will cause erythema and swelling. A weal may develop, producing a necrotic area which can take eight weeks to heal. Pain or numbness at the site of the bite may be followed by sweating and nausea lasting for up to 24 hours.
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