Hi, My Partner Accidently Picked Up The Bottle Of Hair

hi, my partner accidently picked up the bottle of hair developer instead of lubricant, it was about half an hour before he noticed and hoped in shower to wash off, he is in a lot of pain, unable to stand any touch
at all and agony when urinating. The outside of his penis he says is ok, but the eye and down the urinary tract is red and sore.