My son has a itchy rash all around his neck on his shoulders and arms what could it be?

More info. A description of the rash would help pinpoint the cause. I do not want to speculate about the different possibilities.
See doctor. as there are too many possibilities to try to diagnose it over the internet.

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What can cause an overnight itchy rash on my chest, arms and neck?

Allergic reaction? An itchy rash on chest, arms and neck could be due to an allergic reaction. If it suddenly occurred overnight, it is is possible that is is due to a reaction from something in the bed like bed bugs. Try OTC antihistamines (zyrtec, allegra) to see if rash resolves. If not, please see primary care provider. Read more...

I've got a red bumpy itchy rash that stared on neck and middle of my arms and now going down me back realy buging me now?

See a dermatologist. Or at least see a DR. You need attention without delay. How long? Used anything on it? Ever before? An exam is indicated, best by a skin specialist. Read more...
Reaction? If you have a new medication, vitamin or skin/laundry product, you could be causing this type of rash. Try to eliminate dyes and perfumes used in products on the skin, in the shower and laundry. If rash continues, see your doctor. Read more...

I've got a red bumpy itchy rash that stared on neck and middle of my arms and now going down me back realy buging me now?

Allergy & autoimmune. Itchiness means inflammation cause is either allergy or autoimmune ie reaction to pills meds or sunshine. Read more...