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Greetings of the day
These are wheals (Utricaria) probabaly due to sensitivity developed for the drugs. Try taking anti histamines
like Chlorpheneramine maleate and apply calamine
lotion all over the body. These are safe in breast feeding mothers.
In case you need any further assistance, will be glad to assist you.
Wishing you happy and healthy life
Dr T Shobha Deepak