Hello and welcome to HCM,
The painful red bump from which blood and pus is oozing out is suggestive of an infection.
Since, the bump is hot to touch, an infectious etiology is more suggestive.
This lesion may or may not be causrd by spider or any other insect bite.
These symptoma are similar to that caused by boil.
A boil is superficial
skin infection caused by certain bacteria.
Folliculitis is infection and inflammation of roots of hair follicle.
An antibiotic ointment will control the superficial infection. If there is associated pain, pain killers will help.
However, it would be good if you visit your doctor for clinical examination of the lesion.
Clinical examination helps to have a better assessment of the lesion.
Thanks and take care
Dr Shailja P Wahal