My husband noticed this sore on his calf this morning. It has a dark center and is throbbing with pain. We are hours away from urgent care. Does this look necrotic?

A necrotic spider bite, particularly from a brown recluse, often starts as a small, red bump that can resemble a pimple or mosquito bite. Over a few hours to days, the center of the lesion may turn darker, forming a bluish or purplish color as the tissue begins to die. This dark center is a hallmark of necrosis. The surrounding area might be swollen and red, with a diameter that can expand to several centimeters.

As the tissue continues to deteriorate, the lesion can become ulcerated, with the dark center turning into a scab or crater-like wound. It’s important to note that not all brown recluse bites result in necrosis, and the severity can vary based on factors such as the amount of venom injected and the individual’s immune response.

When examining your husband’s sore, pay close attention to the color and texture of the skin. A dark center surrounded by a red, inflamed area is a potential sign of necrosis. Measure the size of the lesion; if it is larger than 1-2 centimeters and expanding, this could be a cause for concern.