Hi , this can unfortunately happen. I had a different type of Lymphoma that actually presents on my skin so lived with these problems for over 14 years.
First do call with your clinical team so they know about this and can possibly proscribe something for it.
You could visit your local Pharmacist as they can give advice and can actually give you a proscription under the small ailments clinic rules.
Practical things you can do is don’t have hot showers or baths, ware loose cloths, no jeans, use good quality moisturisers, drink lots of water and yes - don’t scratch. When you feel the need to scratch.... moisturise.
