I bought a flea collar for my cat and as soon as I put it on her I started to get patches of red bumps and painful iching on my arms, hands and ankles. I looked online to see if there could be anything in the collar to casue this and I found this web site. I took the collar off my cat and now am waiting another day to see if she gets sick. she’s okay now. it’s been 2 days. I hope my rash goes away. watch out. this product hurts humans too.