In most patients, nothing more develops and the area heals. Some victims develop a blister at the bite site that becomes a slow healing ulcer about 1 centimeter in size. They may also have nausea and malaise. In a small number of people, the ulcer extends to greater than 4 centimeters in size, may become infected and is accompanied by fever, destruction of red blood cells and possibly kidney failure. Surgical repair of the wound may be required.
Most bites are mild and fit into the first two groups.
The third type of reaction is rare in this area of the state. There is some indication that the Loxosceles laeta species may produce more severe reactions than Loxosceles deserta . It is important to remember that not all skin lesions that occur are caused by spider bites and in particular by Loxosceles spiders. Many spiders are capable of producing mild skin lesions when they bite. If these do not become infected, they usually heal in a short period of time.