Hello Sharon,
Welcome to BCNA!
I've just finished my fourth on the same concoction.
It's just your follicles reacting to the Docetaxel, and if your experience plays out in a similar way to mine it's the beginning of your hair thinning (My nurses told me that people lose all their hair on this drug, but mine only ever reduced in volume by about 60%).
Blistering can be caused by chemicals in regular shampoos, but if you're already using something perfume-free and hypo allergenic, book in to see a nurse or oncologist. As your rounds compound your body will start struggling to heal itself and you'll become prone to infection so get on top of treating them right now.
I'm using DermaVeen products just as standard now. Nothing harmful in them, cheap, and leave you feeling clean.
My itching and inflammation started around Day 5 and didn't stop until I shaved back my hair and was able to properly wash and moisturise my scalp 2-3 times a day. I hit the shave exactly 2 weeks after first round. It does still itch (likely because I didn't lose all my hair and some are still reacting) but nowhere near at the severity of in those first two weeks.
I hope this has been useful and comforting in some way,
xo Rebecca