We have a heifer, approx. 6 mths old with growths on area around nose, one on left cheek and one on right eye lid. None of our other cows have this. She is a longhorn, if that helps. We at first thought she may have gotten in to some hornets or something but the knots or warts have been on there about a month or month and 1/2. they are not oozing or anything and actually look like warts. Is that what they might be and should we be concerned?