You most likely have a furuncle. And looking at the pain and the pus discharge you will need oral antibiotics which need to be prescribed. Visit a dermatologist near you ASAP. If there is an abscess then you might even need a draining of the pus from the area.
Next Steps
Visit a dermatologist near you ASAP
Health Tips
Do not use creams or 'treatments' suggested by friends or family or pharmacists