Thank you for your inquiry.
You will find a skin test protocol for testing to neomycin in the article referenced below from the Annals of Allergy, Asthma, and Immunology.
Thank you again for your inquiry and we hope this response is helpful to you.
Schroer BC, Fox CC, Hauswirth DW. Skin testing after anaphylaxis to a topical Neosporin preparation. Ann Allergy Asthma Immunol. 2008 Oct;101(4):444. doi: 10.1016/S1081-1206(10)60324.
Phil Lieberman, M.D.