My son who is 9 years old I believe was bite by a some type spider on his upper foot. It has gotten swollen and I popped the white head and was able to squeeze some puss out. I am trying to figure out if I need to take him to the doctor as it is still swollen. I have been having him soak in baking soda water, putting perioxde on it and then doing cold compresses. It is still red and hurts when I touch around it...what is your recommendation???