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I understand your concern.
As per the history and image provided (the attachments rae removed to protect the patient's identity), it appears as urticaria. Urticarial rashes may be due to hypersensitivity, where one's body immediately and excessively responds to an insect bite and other allergens, including medications, dust, changes in body temperature after a shower, due to exposure to sun or cold, due to food allergens, etc. They may appear on and off and may present life long or may reduce in recurrence eventually for some individuals. They may even appear following an insect bite.
1. Mometasone ointment on the affected area at night daily for two weeks.
2. Tablet Cetirizine 10 mg one hour before sleep at night for one week. Please make sure not to drive or go out after consuming this tablet, as they may cause sedation to most individuals.
3. Fucidin cream (Fusidic acid) once daily in the morning to prevent secondary infection following itching and due to the location of the lesion. Urticarial lesions may be managed each time they appear with the above medications alone. Usually, antibiotics are not mandatory. However, they are prescribed to prevent secondary infections.
Therefore, topical application of the same is more beneficial rather than oral intake of antibiotics.
Kindly make sure to avoid any known allergens and, if possible, note down any particular allergen that, when used or consumed, may lead to the lesions being formed again. Stressful events and temperature changes may also be contributing factors; therefore, managing stress, if any, may be helpful.
I hope you find it helpful.