Welcome and thanks for posting your query on HCM.
As per your query you were bitten by spider since last friday and presently have swelling. Spider bit is a type of insect bite hypersensitivity
where we commonly find redness
and itching with pain over the areas bitten by insects.
You need to be worried about the same. It sometimes takes couple of days to get reduced. You do not try to do anything over it like any hot compression or any cream application rather can do cold
water compression over the affected part. If the redness increases or pain arises in next 72hours then you can consult a doctor for the best of medications.
I hope these informations are helpful to you.
Wish you good health.
Dr Sanjay Kumar Kanodia
(MD- Dermatology & STD