Constant itching scalp

@jeanadair123 I was wondering if the itching you are experiencing might be related to eczema. My husband has eczema, but hasn't complained of scalp itchiness, but he does use dandruff shampoo. I found this link about scalp eczema that may be of interest.
https://eczema.org/information-and-advice/types-of-eczema/scalp-eczema/
Have you consulted a dermatologist? They might be the best to determine the cause of a skin problem.

Do you also get scalp pain? There are discussions on Connect about that. Itching is a low threshold of pain which can also come from nerve irritation and might not be related to a skin problem. Here is a discussion that talks about scalp pain.
https://connect.mayoclinic.org/discussion/electric-shock-type-pain-in-my-scalp/?pg=22#comment-611924
I use a shampoo that has tea tree oil and I like it. Have you found any relief with tea tree or peppermint oil?

Thank you, I have consulted a dermatologist he said I have very slight dermatitis, they gave me some shampoo that had quite a few side effects so I didn’t use it. I have been mixing 20 drops of tea tree oil and 10 drops of peppermint oil in 1 tablespoon of olive oil. I use a dropper and put it all over the roots of my hair. I leave it on for hours and during that time my scalp doesn’t itch. I use organic tea tree shampoo and conditioner. I have also been using selsun blue shampoo. I am going to try cider vinegar and water and leave that on for a while. The last few days it seems much better so hopefully something is working. I asked my gp for any other ideas her response was keep doing what your doing, not much of an answer I should have just posted on here.
I will checkout the info you gave me and I appreciate it very much.
Thanks

FOUND SOMETHING WORKING FOR 2 DAYS SO FAR. I was going crazy with an itchy scalp, no dandruff. I do have rosacea. This is what I tried. Dandruff shampoos of every brand, tea tree products, vinegar & water mixture which gives some relief all day (I pour a cup over my head after shampooing, takes out all product residue), changing hair care products numerous times, unscented products......you name it and I have tried it. What has worked for 2 days so far is this: I took 2 boric acid capsules and dissolved them in water, poured it over my head and DID NOT rinse. ITCHING IS GONE!

oh another thing I tried is the lotrimin, chlortrimazole, yeast products like for athlete's foot and jock itch and they work also but only for a couple of hours. I sprinkled some athlete's foot powder onto an itchy spot and it quits instantly so I can get through the night, also pure with hazel works well temporarily, niacinamide preparations like from The Ordinary also works but very temporarily. The boric acid is best so far

Educate yourself about a common form of eczema many of us develop later in life. Allergic Contact Dermatitis, ACD. You will never guess what is triggering your scalp itch. Simply treating the itch won't stop the cause. Like you I've had cancer and often with cancers our immune systems don't protect us like they used to. Also repeated contact with know elements both natural and chemical cause our body to raise up our histamine army trying to protect us and eliminate them from our system and thus we get rashes or burning or itching or pain.
Google the 5 Day Extended Patch Test, one such common test kit is the True Test Kit. It's an expensive test, around $1,500 covered by most insurance plan as well as Medicare. With this test I learned that every shampoo I was using, from Johnson's and Johnson's Baby Shampoo to Head and Shoulder's and others included allergic contacts. You could be allergic to the coconut, fragrance or as in my case several preservatives triggered my allergies. With testing you will be registered and given a code in which to go to a site and products that are safe for you are suggested.
Do not settle for a diagnosis of dermatitis!!! I did for years because my dermatologists, and I saw several over 10 years never told me about this test which only specially licensed allergists or dermatologists can administer. Out of about 80 plus patch sites I now know about 15 natural and chemical elements I must avoid for life. No more scalp itch for me. I used to pull on my hair while watching TV at night with my husband as it helped to distract from the itch, He would warn me I would go bald but the itching was maddening.
In the meantime you need to eliminate allergic sources and just shampoo with a basic old fashioned soap like Grandma's Lye soap, this bar soap only contains lard and lye and the lye becomes glycerin during the traditional soap building process, Google this Mayo Skin Safe product for an explanation. Also VMV Clark Wash is about the safest shampoo I am aware of on the market sold on the internet. Tea tree oil has been recommended, but Google the fact that some are allergic/eczema. I can also safely use their conditoner, but you may not! We all have a unique combinations of allergens causing our allergic dermatitis Read and study every ingredient and every product you use on your hair. Go to internet and check for allergic reactions. Self education, along with testing is the key to overcoming it like I have.
If you were told you had cancer your first question would be, "What kind?". Don't settle for simply being told you have dermatitis of which there are dozens of types. Yes, you probably do have a form of dermatitis, but you need a specific name of your type of dermatitis. Dermatitis and eczema are interchangeable words.

Where do you get boric acid capsules???? I've looked all over the internet and can't find them. Thanks!

My dermatologist prescribed Diazapam and so far it seems to be improving. His logic is that there are lots of nerves running through the scalp and this could help. I have no other scalp issues.

@jeanadair123 I find using any kind of hair conditioner causes my scalp to itch. So even though my hair is dry, I don’t use a conditioner. Someone suggested an apple cider vinegar rinse which I tried and almost hit the ceiling with the burning of my scalp! I also find an antihistamine tablet helps ease the itching.

I am also having extreme problems with itchy scalp. There is no dandruff. I have tried all the itchy/scalp shampoos with only minor, short-lasting relief. Conditioners do not help or hurt. This developed at the same time palpable red/purple dots showed on my calves. They are extremely itchy. Substantial, unintentional weight loss also began at this time.

@susan824 how long have you had the itching and spots? What does your doctor say about this?