thanks for writing to us.
To treat your injured area
clean with antiseptic soap and warm water.
let it dry and then apply an antibiotic cream like nadifloxacin
or fusidic acid
redness around lesion suggests inflammation, take an analgesic
to help the inflammation subside.
Hopefully in three to four days the lesion should start healing. Howver if not much response is seen, consult a doctor nearby to start a course of oral antibiotic.
Hope that helped.