A skin inflammation or rash resulting from exposure to sunlight, X-rays, or atomic particle radiation: Chronic or recurrent actinic dermatitis can lead to skin cancer.

Contact dermatitis caused by an allergic reaction to or an irritation from substances normally encountered in an occupation.

Gangrenous necrosis of the skin of the thorax and thighs of chickens of one to four months of age caused by Clostridium septicum and other clostridia.

Clostridia refers to any of various rod-shaped, spore-forming, chiefly anaerobic bacteria of the genus Clostridium; such as, the nitrogen-fixing bacteria found in soil and those causing botulism and tetanus.

Most affected birds die and the mortality rate in a flock may be as high as 60%. Also known as necrotic dermatitis.

An inflammation of the skin or a rash resulting from excessive washing of the hands or an irritation caused by sensitization to a substance: "Those who wash their hands many times a day can develop irritant contact dermatitis also known as dish pan hands."

Another example of irritant contact dermatitis is when young children lick their lips repeatedly which can result in an irritant reaction to their own saliva."

A form of inflammatory skin rash that results from excess activity of the sebaceous glands in the skin; dermatitis seborrheica; eczema seborrheicum: Seborrheic dermatitis is an acute, long-term inflammatory form of dermatitis, occurring usually on oily skin in areas having large sebaceous glands.

Seborrheic dermatitis is characterized by dry, moist, or greasy scales and by crusting yellowish patches, remissions, exacerbations, and itching.

Dermatitis in humans produced by irritation by spicules, hairs, and scales of the epidermis of plants.