Dear sir age 30. I work merchant navy. Every year at least work 6 month on ship. My skin problem facing. Some rashes ,rough, like white small spot coming .it is started from back side then covered whole body even face also. My skin colour became dark this time. I used soap for bath. After bathing I pressed on this spot area by finger then came out dirty .I used candid powder then skin roughness slightly solved but specially my face skin become dark this time. Pls advice me. Thanks