What Causes Itchy Welts On The Stomach, Neck And Legs?

my mum just recently stopped taking amlodopine and glyburide on the advice of her doctor as her sugar and blood pressure were low. She has started experiencing some itchy hive like welts on the side of her stomach, back of her neck, on her leg near her groin. Most of them have dried up but some of the itch remains, and new ones have appeared on the other side of her stomach. I have been putting rubbing alcohol on them and this seems to soothe her and also when she takes a hot shower this also soothes her. I believe this could be a symptom of her coming off the medication as it started after she stopped taking these meds. She still takes metformin twice a day, isosorbide for her heart in the morning and an adult aspirin at night. Should this be concern? Your thoughts.