so my doctor tells me that i have hives due to some allergic reaction and prescribes me prednisone for the rash (which is a steroid itself) for the itching and rash, and also hydroxyzine hcl for the itching. didnt tell him that ive been on steroids. im supposed to do my shot today. should i wait until i get better to do the shot or will it be ok to inject today while on these meds? thanks.