I burnt my ankle on a motorcycle exhaust and its been 4 days and it still hurts to walk on my foot... help

Wow - a burn by something dirty like a motorcycle part on a part of your body - an ankle - that requires a lot of flexibility - this has to be treated professionally. If it hurts to walk you probably have an infection, so probably need antibiotics. You also need a current tetnus shot. And you probably need the wound treated to make sure that it heals adequately without bad scarring so you maintain the full range of motion in your ankle. Go to a hospital. If you get an infection it can spread very quickly so this needs to be treated as an emergency.

Thank you for the info Ive been cleaning it and putting silvadine on ot so I don't think its infected...