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.
A: Bumpy ridges on the fingernails can be caused by aging, nail injury, lack of moisture or poor nutrition, according to Dr. Phoebe Rich, M.D., clinical adjunct professor of dermatology at Oregon Health Science University. Aging is the most common cause of bumpy fingernails. Continue Reading