What Causes Itching And Bruise All Over The Body?

I have intense itching all over my body. It's worse on areas where I shave ie legs, underarms but pretty much everywhere, arms, head, tummy, back. Alot of the time it starts in 1 place & the urge to scratch other areas follows. The itching is so intense that sometimes I bruise & break the skin. I use ph 5.5 products always & body lotions post shower/bath but nothing helps. If anyone can help I would be so grateful as I live in a hot country & wearing a skirt, shorts, bikini is unthinkable now as my skin is so sore & it just looks awful. Thank you.