Panel scratch test and followup question

Patient : Allergy panel scratch test.. I did an initial assessment.. Sat down with the allergist and we talked about my symptoms, typical environment so on and so forth..She had suggested we do a panel scratch test.. environmental extracts. Well the family doctor that referred me and the Allergist's assistant both failed to inform me not to take any antihistamines from 5-7 days before my visit to ensure proper and valid results of the scratch test.. Anyhow needless to say I only reacted to histamine and mildly at that. So we rescheduled after it was asked if I was taking any antihistamines. Obviously this makes perfect sense and I literally did a palm slap to my forehead when I realized it.. However given it was my first test how was I to know? Anyhow the question is what about allergy eyedrops that contain antihistamines.. will they effect the scratch test or will the antihistamine used in the eyedrop remain local to the eye as opposed to somehow messing with the immune response in the forearm?
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