Kero is still scratching and biting at himself.
We've given him loads of flea treatments, bathed him in shampoo special for dogs like Westies that get skin irritation, and put anticeptic cream on his sores.
If anything he's biting and scratching at himself more now; he's making himself yelp and bleed.
So, we cancelled his grooming appointment - since we figured a haircut when he's so sore probably wasn't something he'd be too happy about - and we took him to the vet today.
The vet couldn't find any sign of fleas, so it looks like we got rid of those. And other than being covered in these sores he's perfectly healthy. He's even lost 1kg (2.2lbs) that he needed to lose.
That leaves us with two options. Either he made himself so sore while scratching from the fleas that he now has sores that are itching while trying to heal, so he's biting and scratching at them and making them worse. Or, he's managed to end up with one of the skin irritation issues Westies are known for getting, which could have happened from him scratching with the fleas, or could have happened at the same time but without the two things being connected.
Either way, he's got some antibiotics and steroid pills to take for a couple of weeks. The antibiotics are because - despite my efforts with the anticeptic cream - there's signs of infection in his sores. The steroids are to hopefully stop the itching (or, at least calm it down enough that he's not scratching and biting at himself all the time).
If it's sores from him scratching because of the fleas, we "should" see signs of them healing by the time the pills run out. If it's general skin irritation he may need to be treated for it for the rest of his life.