Thanks for the query.
You might behaving a infected cystic acne which has given way and is flat now. The antibiotics taken stay in the blood for quite long and keeps working, even if you stop them. So further oral medications may not be advisable and that is the reason that there is a fixed duration of treatment for most diseases. You can use fusidic acid but can avoid the other one for few more days.
Next Steps
Meet a dermatologist.
Answered2016-08-22 05:35:32
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