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Hello and thank you for the question.Answers given are for informational purposes only and are not meant to replace an exam by an in-person.I am Dr. Sohaib, a practicing Internal Medicine Specialist and I will do my best to help you today.
These symptoms are highly suggestive of an infection, most likely viral infection which gives more generalized symptoms (like nausea, chills, body aches, fatigue, rash, fever) rather than localized symptoms (as it happens usually in bacterial infections).
Now if he already started to improve, I would suggest some home remedies like plenty of liquid intake, Tylenol for control of pain and fever etc.
Most of these infections are self limiting, but there are some clear indications to seek medical care including;
Shortness of breath
Prolonged symptoms beyond 72 hours
I think a watchful monitoring is required for the time being, but in case of any warning symptoms, he should seek medical care.
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