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Identifying Spider Bites: Signs and Appearance

Are all spiders venomous?

The United States is home to more than 350,000 species of spiders. Although most of these species are not dangerous, it is important to learn how to identify their bites. According to studies, only two species can lead to serious medical concerns in humans: the recluse and the widow.

Almost all spiders bite. However, they have weak and small fangs. So, they cannot penetrate human skin. Their toxins are weak and dangerous to certain prey. When a spider bites you, it may leave a red or itchy wound on your skin. In most cases, the wound usually leaves after a few weeks.

Certain species of spiders have powerful toxins and strong fangs that can penetrate human skin. Bites by these species can lead to serious medical complications, including severe muscle spasms, and necrosis.

Spider bites do not always lead to a reaction. However, you may notice two scars where the fangs punctured the skin. It is easy to identify a spider bite if you saw the spider that bit you, because you may notice the mark until a few hours later.

A spider bite may have the following manifestations:

  • Swelling
  • A red welt
  • Skin damage

You may experience other serious symptoms when a spider bites you. These symptoms may include:

  • A red or purplish blister
  • High blood pressure [1]
  • Itching or rash
  • Pain around the area of the bite
  • Muscle pain or cramping
  • Difficulty breathing
  • Headache
  • Sweating
  • Nausea and vomiting
  • Fever
  • Chills
  • Rashes
  • Swollen lymph glands [2]
  • Restlessness or anxiety

Spider bites may take longer to heal and may affect your skin tissues. It is important to clean the bite regularly to prevent infection.