The cut is on the knee. I fell on the part tarmac and mud path. the graze is about 3-4 cm long and was full of mud and grit. I cleaned the graze with TCP and antiseptic wipes and cleaned most of the dirt out, but was not able to clean all the dirt out. 24 hours later the graze is sore and the skin around the graze is red, warm and slightly swollen. what should I do?