Hi and welcome to HCM.
It seems like this cut got infected. You should visit docotr or pharmacist and take some antibacterial creams to apply on it. It this progress then antibiotics should be taken or surgical procedure performed.
Also there are creams which facilitate wound healing
.You should consult your GP about it. Till that, just wash your wounds frequently,dont scratch it or touch with dirty hands.
Wish you good health.