Urine on skin giving strange effects

Hi. I just tried yesterday to put urine on my face and my skin had some reaction, like irritation, it didn't get red but is not too smooth and slightly tickling. I remember it did exactly the same another time I tried 5 years ago, after having used it for a while without problems all of a sudden the skin began to get irritated. Do you think I should drop it or is it just a healing phase? maybe should I use only aged urine?
thank you
sofia
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