The ONLY way to produce a tiger or lion with a white coat is through inbreeding brother to sister or father to daughter; generation after generation after generation. The kind of severe inbreeding that is required to produce the mutation of a white coat also causes a number of other defects in these big cats.
Causes of Bumps on Skin. 1  Acne (Pimples) Acne is a localized skin inflammation as a result of overactivity of oil glands at the base of hair follicles. 2  Actinic Keratosis Actinic keratoses are rough, scaly patches of skin that are considered precancerous and are due to sun exposure.
Hard lump under skin can be caused by a common condition called angioedema, an allergic reaction that causes deep welts to form under the skin, specifically by the lips and eyes. The reaction can be triggered by some foods and medications. Cysts and nodules can as well be the cause of hard bumps on your face.