Hey dear...first of all congratulation for the precious days of your life.. your pregnancy.. And you dont worry about this condition because its very very common during pregnancy.. During pregnancy,there is more production of melanin(the substance of the body) causes hyperpigmentation of the skin,which may causes patches on your body parts.. Another condition like pruritic urticarial papules and plaqes during pregnancy,it is an outbreak of pale red bumps on skin. This lesions may cause itch and burn All this condition will subside after giving birth to your baby...so dont wory..and take care...thanks for asking....will help you whenever you need..have a nice day