How To Get Rid Of Cancer Spots On Both Lungs?

hi,my name is joan,my boyfriend mark had colon cancer back in nov o9,had surgery for that,and than found 3 turmors on the liver,chemo took care of the 2 tumors,but left one tumor on the liver,which grew to 12 centermeter,in oct 20010 mark had half of his liver removed,now he has cancer spots on both lungs,he has chemo once a week,so now he has a very bad rash on his face from the chemo.cant find a good cream or pill to get rid of the rash.marks chemo is the kind that will only attack the cancer and no other organ.do you know how long he will have to be on chemo,and where is all this cancer coming from,is it in the blood cells.