Spots and potential corrosion?
If you find that your knife has got spots on the blade and that you're starting to see some corrosion, you've probably got a knife with a carbon steel blade. As mentioned, this makes it sensitive to moisture and water. Be sure to take special care of it: cleaning, drying and oiling your blade after use usually does the trick.
Another option is to get a stainless steel blade that don’t need as much maintenance. Our stainless steel knives are not only more “easy care”, they also keeps an edge longer as the stainless steel is more wear resistant. Note that cooking in general, salt water, fruit juices, vinegar etc usually makes a carbon steel blade starting to corrode within seconds.