Thanks for choosing HCM.
I feel you have got a bruise
/ an insect bite, which needs the following care-
1] Give Cold compress to the affected area.
2] Apply Calamine
Take any mild pain relievers like Paracetamol
for 2-3 days.
4] If not better consult a doctor to see the need for any antibiotics.
5] Take a shot of Tetanus Toxoid
6] If you are a Diabetic , see the doctor soon.