The original transparent case I bought for my Nothing 2 phone started to turn yellow in a short period of 10 days.
It’s really sad that original accessories deform so quickly.
Don’t worry, I wash my hands every day 
Phone (2) Case Started to Yellow
noyanabi53 this is due to sweat of hands but it’s yellowish color come after 1 year or 9 month, in your case seems like it’s due to bad quality of case
As mentioned above discolouration of clear phone cases is in relation to oils and sweat from your hands that transfer to the case, even if you do wash your hands 
I’d contact support and discuss with them as it has only been 10 days, as Diljeet says, this seems abnormal. In the future, I’d recommend also cleaning the case (without the phone in it) on a regular basis to avoid discolouration.
I always thought the Nothing official accessories were of a high standard, my transparent Phone (1) case was hard wearing with no discolouration over a period of 1yr.
Rob ⚡️ changed the title to Phone (2) Case Started to Yellow .
noyanabi53 same happened to mine too but after that I took the ringke fusion x black case for np 2
I wanted a case that doesn’t cover the back design of the phone , should offer protection against drops and also look good and not yellow
After a little bit of searching I got this even if the sides yellow becoz of the sides being black u can’t see it much . I have been using this from 4-5 months n it have never caused an issue
Mine is over a year old and browning at the edges. Pretty normal with transparent plastic I think.