Signs and symptoms of a black widow spider bite include all of the following EXCEPT ________.

The signs and symptoms of a black widow spider bite are well-documented and include a range of systemic reactions. Muscle spasms, fever, and severe abdominal pain are all common manifestations of a black widow bite. The neurotoxic venom of the black widow can lead to muscle spasms due to the disruption of neurotransmitter regulation, causing painful contractions that can affect various muscle groups. Additionally, systemic symptoms such as fever can occur as part of the body's immune response to the venom.

Severe abdominal pain is often reported, giving rise to a clinical presentation that can sometimes mimic appendicitis or other acute abdominal conditions. This pain arises from the effects of the neurotoxin on the nervous system, which can affect the abdominal muscles and organs.

In contrast, while some spider bites can lead to localized tissue damage, an ulcer at the bite site is not a typical symptom of a black widow spider bite. The bite usually results in a small puncture wound and does not typically progress to ulceration. Thus, while localized symptoms can occur with other types of spider bites or infections, they are not characteristic of the envenomation by a black widow spider. This makes the presence of an ulcer at the site the exception among the given options.