You probably should see your veterinarian about the application of the flea medication. If you need to work on allergies I would suggest the homeopathic DERMA-IONX to reduce itchiness. Initially I prefer to give 10 drops twice daily with breakfast and supper. After some improvement is seen you can give 20 drops once daily. I also like to take a holistic approach by giving probiotics and Omega 3,6,9 to heal the gut and reduce inflammation.
Please let us know how you do. Have you seen any fleas?