Christopher - it depends on the cause. If your brother keeps exposing himself to the stimuli causing them they could potentially never go away. But if he stays away from the stimuli and the allergic response stops, they'll go away in 1-3 days. They'll go away faster if he takes benedryl. that could potentially take them away in a few hours.
My brothers has hives and wonts to know
Christopher - it depends on the cause. If your brother keeps exposing himself to the stimuli causing them they could potentially never go away. But if he stays away from the stimuli and the allergic response stops, they'll go away in 1-3 days. They'll go away faster if he takes benedryl. that could potentially take them away in a few hours.
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