you are almost past the point where infections show up so that's probably unlikely. before you call your surgeon's office have someone look at the area. is there build up because rinsing routines might have changed to not rinse there as well (we use t-sal shampoo for scalp skin plaques that build up, happens with stress, but it would help remove other build ups). if it is red or at all puffy around the surgical scar or shunt bump, get in right away! if nothing is visible, keep an eye on it as you may be having a reaction to the implant materials or something from the surgery, that should be unlikely but rare stuff happens. I can't think of other stuff we look for but maybe someone else will have a suggestion.

sorry for being late in getting back to your response, The past two months I was suffering with a bad neck and had to get an epidural. Probably not related but everything that happens to me now makes me suspicious of the shunt. Thanks again and I will try that shampoo. I'm careful shampooing around the shunt but the itchy scalp is throughout and only started with the shunt surgery.

thought of one other consideration - one thing our child did, before she could talk, she would scratch her head (a lot, and her head would sweat like crazy when lying down), her setting was too high and she needed a lower setting to drain. After being adjusted (~20 months) she stopped scratching, started walking a few days later, climbed a ladder a few weeks after that. If there's nothing else, you may want your actual pressure checked. We saw that shunt didn't drain when lying down with shuntogram but that test can be hit or miss; it can really depend on the person doing it.

the stress that causes plaques for our child is probably a form of psoriasis (seems related to how well her shunt is working sometimes) stress of a surgery can trigger such a response in some people.

it can take a while to figure out what is the issue, hope that goes as fast as possible.