A dermatologist is a medical expert you should consult if you have any significant problem with your skin. Dermatology is the science that is concerned with the diagnosis and treatment of diseases of the skin, hair, and nails. Dermatology involves but is not limited to study, research, and diagnosis of normal and disorders, diseases, cancers, cosmetic and aging conditions of the skin, fat, hair, nails, and oral and genital membranes, and the management of these by different investigations and therapies, including but not limited to dermatohistopathology, topical and systemic medications, dermatologic surgery and dermatologic cosmetic surgery, immunotherapy, phototherapy, laser therapy, radiotherapy, and photodynamic therapy.