Iv had red itching spots wiv watery heads on covering my upper body (chest and arms) it's now spread to my legs feeling very tyerd and sick?

Doctor can evaluate: A primary care doctor can evaluate, as rashes are hard to describe in words. One possible cause of water-filled small blisters could be chicken pox. Chicken pox starts as small reddish spots, which form a very small fluid-filled blister in the middle of each spot. The small blister breaks easily when rubbed, releasing a tiny drop of clear yellowish fluid. Each spot then forms a small scab.