Hi I was bitten by something on friday there is a red mark. Since then a red line has appeard and getting longer daily. About 10cm now. It goes from my breast and under arm. Its a dull pain and I have had sore throught like the flu. Any advice will be gra

See a doctor. South Africa has bugs docs in the USA don't know about, so you should probably see a local doctor. Red streaks that start at the point of a bite like this can be an infection and require antibiotics. This kind of infection can be quite serious so don't delay. Best wishes!