It will take 7 to 10 days, from day of beginning, to resolve.
For fever you can take tab paracetamol 500mg 1 sos ( when fever occurs), so hot saline gargles. Take tab cetrrizine 5mg one morning and one evening for 4 days to have relief in itching.
Next Steps
Do not scratch the lesions with nails. Do not remove scabs manually as that can lead to scarring.