If your skin sometimes irritates you because it is oily or itchy, try these natural tricks. For itchy skin, add 8 ounces of apple cider vinegar to your next warm bath and soak for 15 minutes. For oily skin, combine equal parts apple cider vinegar and water. The acidity in the vinegar makes a natural astringent or freeze. Make them in bulk by putting the solution into ice cube trays to use as a low-cost treatment during the hot and humid summer months.