My family and i have develop small very itchy pimple all over our body?

Rash: Depends on where you all have been and been exposed to. It's probably an allergic type reaction even as simple as new detergent or soap. If noone has any fevers or other symptoms you can probably try some cortisone cream and see if helps.

Dermatitis: Sounds like a contact dermatitis- which is similar to a allergic reaction to a substance. These can be solved with removing the offending substance. Benadryl (diphenhydramine) may also help.

Eval needed: These lesions need to be visualized & a history needs to be obtained in order to make an accurate diagnosis.