This same thing has happened to me twice. The first time I used it I didn't notice anything. Th second time I noticed what you are describing but I was not sure ti was the Nioxin, so I tried it one more time and let it run a little, and boom, my neck got red right were the Nioxin ran down. I am afraid it might be happening in my scalp, and I cannot see it. I put Benadryl cream on it and it went away.
Yes I just started with Nixon 5 shampoo and conditioner and on both occasions within 10 minutes have broken out in a red ras and hives on my neck and shoulders. Took Benadryl once but am thinking of discontinuing my use of these products.
This is a real old post from like 12 yrs ago!
Nioxin used to be a good product but like other companies they changed the formulation. I liked the original
I just had the exact same thing happen with the serum. It may have been the first time it had run down my face but there is a red stripe down the side of my face and a round mark on my neck. I think it has probably been doing this on my scalp but I thought the tingling feeling was the product working. No more Nioxin now that I see what it has done to my face!