» Callus
a localized firm thickening of the upper layer of skin (epidermis) as a result of repetitive friction. Calluses on the feet may lead to other problems such as serious infections.

» Chapped Lips
dry, cracked or sore lips, usually in cold, windy, dry weather and less often in warm weather. Sun exposure can contribute to chapping of the lips.

» Chronic
of long duration or frequent recurrence, resistant to all efforts at eradication.

» Coal Tar
a black, thick, opaque liquid obtained by the distillation of bituminous coal, often used in topical treatments for Psoriasis and other chronic skin disorders; side effects include sun sensitivity and irritation of acute dermatitis.

» Cold Sore
a small sore situated on the face or lip that causes pain, burning, or itching before bursting and crusting over. The favorite locations are on the lips, chin or cheeks and in the nostrils. Cold sores are caused by herpes simplex virus type 1, which lies latent (dormant) in the body and is reawakened (reactivated) by factors such as stress, sunburn, or fever from a wide range of infectious diseases including colds and the flu.

» Contact Dermatitis
inflammation of the skin (eczema) caused by direct contact with an irritating or allergy-causing substance.

» Contagious
capable of being transmitted from person to person.

» Corticosteroids
Any of the steroid hormones made by the cortex (outer layer) of the adrenal gland. Cortisol is a corticosteroid.

» Cutaneous
having to do with the skin.