I think this can be a recluse spider which is extremely dangerous.
The venom contains sphingomyelinase D, which damages the cells in the skin tissues causing necrosis, giving the lesions their characteristic ulcerations. In general, bites from recluse spiders produce little more than localized swelling and erythema (redness of skin) or mild lesions that are commonly misdiagnosed as cellulitis or anthrax. Signs of infection after a few days and appropriate antibiotics can prevent progression to generalized purulent systemic illness (sepsis). The apparent lack of old wrinkled people with such wounds may seem significant, but is not at all unusual for any part of North America where the spider remains rare.