My father is having an allergic reaction to ammonium lactate. Both arms are deep red itchy swelling. His Dr said stop using which he did but after a week no improvement, no advice from dr to clear up side effects. My dad is 90 and very uncomfortable. Would alleges or Claritin help. He finished 6 weeks radiation on his face in april. Problem more under the skin like bruising and purplish more than surface rash.