Hi im a 26 year old female and ll in the sudden I had the great big rash ocurr all over my body. Its specificaly more pronouced on my hands and arms.?

Eval. This can't be diagnosed with the information that is available. A history, physical examination & other studies may be needed to determine cause/causes. Once accurately assessed a treatment plan can be developed.
See doctor. and have it checked and diagnosed then it can be treated.
Viral/ allergy. Viral extanthum can present this way. Additionally personal products, medications and new dietary intake can all be responcible. As allergic response.