Thanks for posting your query.
Itching and numbness
is usually caused by irritation to nerves or compression of vessels. some toxin formed in our body due to high unsaturated fat
diet can irritate nerves. Vitamin B12 deficiency
can also damage nerve cells and cause itching and numbness. Sometimes obesity and bad posture can cause numbness in arms and legs.
You are advised to get some tests like Vit B12 levels, uric acid, urine test and CBC.
You should take healthy balanced diet.
Regular exercise can help.
Hope it helps.