Make a paste with baking soda and a little water, this should bring out the itch, and the swelling, take some ibuprofen if you can. Hope this helps, good luck to you.
We need more information to try and answer your question. What do you mean by this? Do you mean you are trying to draw a replica of what a spider bite looks like, or does someone actually have a spider bite and would like to know what they can do for it???