Most Spider Bites go away and heal fully within 6 to 8 weeks so if the spider bite has gotten worse or isn't healing up after 8 weeks then you might want to see a doctor.
Or if you become ill soon after the spider bite then you should see a doctor or go to urgent care just in case you've been bitten by a poisonous spider.
Spider Bites typically cause redness, swelling and even pain around the area of the spider bite which usually goes away within a day or two but if not or it gets worse then see a doctor or go to urgent care just to be safe.