Hi there...I can understand your concern. It would have been better if you had attached a photo of the wound. Did your ankle just touch the silencer? And now it's just a burn wound. Or did the bike fall on your ankle? If it's just a simple wound, then use plain antibiotic cream like mupirocin or fusidic acid cream. Apply it twice daily. Use only lukewarm water to wash the wound. Do not use any soaps or antiseptics solutions like dettol. If the bike fell on your ankle, then consult a orthopedic for further evaluation. If the wound doesn't look like healing in 10 days or if there's pus discharge, then consult a general surgeon for further evaluation. You might need oral antibiotics if there's pus discharge.