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I have gone through your case. I have two diagnoses in your case.
1. Insect bite reaction, and 2. herpes zoster.
Insect bite reaction does not require any treatment, but you need to follow the treatment as early as possible. Kindly consult your doctor to discuss the suggestions and take the treatment with consent.
1. Tablet Acyclovir 800 mg five times a day for seven days on following timings, at 6 and 10 AM, 2, 6 and 10 pm.
2. Tablet Cetirizine 10 mg at night for seven days.
3. Fucidin cream (Fusidic acid) two times a day.
The Probable causes:
Herpes or insect.Preventive measures:
Drink plenty of water.