Black spots can be due to several causes. It can be just blemishes, moles, warts, freckles, etc.Moles on the body also need to be evaluated to know what type they are. A treatment can be suggested thereafter. So consult a dermatologist for the same. Moles can be removed by RF, laser or surgically under local anaesthesia. Roughness of skin can be due to dry skin, application of irritant creams and use of strong soaps, abrasives, etc. Shift to a subset based soap and apply moisturiser immediately after bathing to keep your skin soft and supple.