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If someone has hives that improved transiently with the first day of steroids and then returned, there are a couple of options to consider. First, it may help to use a stronger regimen of steroids, such as an IM injection of a steroid followed by an oral taper. Second, there are some secondary medicines that can be considered, including antihistamines, H2 blockers, or doxepin. Third, there can be consideration that there is ongoing exposure to something that is causing the hives. If there is something new to which you are being exposed, either externally or internally, then that would naturally be the substance that would be suspected. A detailed evaluation, such as by an Allergist is usually only done for chronic symptoms, but if the hives continue, that may need to be considered.
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It is impossible to determine over the internet what is causing hives. It is also frequently difficult to determine the cause when able to examine the patient, as must be true in your case, or your doctor would have already told you the cause of the hives. That is also why we usually will only treat the hives when someone has recent onset of hives and reserve the evaluation for only those people that have persistent hives, as I noted above.
There are several H2 blockers that are available over the counter, including ranitidine or famotidine.
I have given you several options that may be able to help.