Description

Many human spider bites are caused by the yellow sac spider.


 

Genus: Cheiracanthium

 

Distribution: world-wide

 

Characteristics:

(1) The 2 front legs are relatively long compared to the other six.

(2) The spiders are pale in color.

(3) The spider has a silken retreat or sac where it hides during the day.

(4) The spiders are attracted to hydrocarbons in gasoline.

 

Bites may occur:

(1) outdoors during the summer (in the garden, under leaves)

(2) indoors

 

Features of a bite:

(1) The bite may be painless, painful or have a burning sensation.

(2) The bite may be followed by erythema, a rash, swelling or blistering.

(3) Occasionally a patient may experience mild systemic symptoms.

(4) The patient may develop a necrotic ulcer that may take several weeks to heal.

 

The bite is often misdiagnosed as a brown recluse spider bite, but it tends to be less severe and faster healing.

 


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