If bitten by a brown recluse spider and left untreated what usually happens to it?

Necrosis: The problem with this type of spider is the venom causes necrosis (death) of tissue. However, there really isn't a medicine that has been shown to stop this damage. Right now the best care is meticulous wound care.

Depends on how you: reacte to the bite. Brown recluse spider's bite can cause no reaction, a mild reaction, an immediate or a delayed reaction. With a significant reaction a which blister appears after bit. The surrounding skin becomes hard, swollen & can be red, white & blue. A deep lesion can develop which can eat through fat and muscle. An infection could set in. Could have a large amount of necrotic tissues