Question

Why do spider bites itch?

Answer 1

when they bite and the venom is injected into your skin, the venom is mainly the reason for the itching and pain, this can also cause an allergic reaction

Answer 2

The spider has a venom in their teeth that they inject into your skin when they bite you so you won’t bleed everywhere and your skin has a reaction to the venom because it’s strong enough to have an effect just not strong enough to hurt you.