I had an allergic reaction to shampoo v05 just now washed my hair with it a week and felt red itchy…

I had an allergic reaction to shampoo v05 just now washed my hair with it a week and felt red itchy bumps on the back of my head my older child said it was red and everywhere I remembered that this happen to me 2 other times in the past and the doctors always said it was an infection but I saw a pattern... the same shampoo so I took 2 benadril and the bumps went away within min ! So much for that anti bacterial creme and shampoo the doctors gave me in the past for 7 days ! Sheesh all could of dissapeared with a simple benadril!!!