Here is a brief summary of various types of eczema and dermatitis.

Atopic dermatitis is a genetic hypersensitivity that usually first appears in infancy, and is often accompanied by food and aerosol (airborne) pollen allergies and asthma.

Contact dermatitis is more common and is most often an allergic response to environmental irritants (perfumed soaps, fabric dyes, cosmetics, feathers, some plants and pollutants). Eczema is not contagious.

Neurodermatitis  is a form of atopic dermatitis characterized by a self-perpetuating scratch-itch cycle. Although symptoms increase in times of stress, physiological changes in the nerve fibers are also present.

Atopic eczema: Allergic eczema,  macular (a circumscribed flat area, up to 1.0 cm in diameter, perceptibly different in color from the surrounding tissue), papular (solid elevation up to 100 cm in diameter on the skin); there are several types) or vesicular eruption due to an allergic reaction.</li>

Baker eczema:  Allergy due to contact with flour, yeast or other ingredients handled by bakers.

Chronic eczema:  Thickening of the skin with accentuated skin lines in eczema.

Dyshidrotic eczema:  A vescular (small elevation of the skin containing fluid) or vesicopustular (a vesicle which is developing pus formation) eruption of multiple causes that occurs primarily on the volar (palm of hand or sole of foot) surfaces of the hands and feet, or fingers and toes. The lesions spread peripherally but have a tendency to central clearing.

Eczema erythematosum: a dry form of eczema marked by extensive areas of redness, with scaly desquamation (shedding of the skin outer layers).

Eczema flexural: Eczema of the skin at the flexures of elbow, knees, wrists etc. associated with atopy (a genetically determined state of hypersensitivity to environmental allergens) persisting through childhood.

Eczema herpeticum: a febrile (feverish) condition caused by cutaneous dissemination of herpes virus type 1, occurring most commonly in children, consisting of a widespread eruption of vesicles rapidly becoming umbilicated (dimpled) pustules; clinically indistinguishable from a generalized vaccinia (small local infection similar to the skin reaction at the site of smallpox vaccination). The two may be distinguished by electron microscopy or demonstration of inclusion bodies in smears, which are intranuclear (within the nucleus of the cell) in eczema herpeticum and intracytoplasmic (within the cytoplasm of the cell) in eczema vaccinatum.

Hand eczema: Eczema that predominantly and persistently affects the hands; of multiple causation, including allergic, industrial, irritant, dyshidrotic, bacterial, and atopic mechanisms, distinguished from chapped hands by the presence of vesiculation or spongiosis (inflammatory intercellular edema of the epidermis {in other words, swelling}).

Infantile eczema: Eczema in infants; the clinical appearance varies according to the dominant causative mechanism like contact type hypersensitivity, candidiasis, atopy, seborrhea (over activity of the sebaceous glands) or a combination including Intertrigo (irritation between skin folds) and diaper dermatitis.

Nummular eczema: Discrete, coin-shaped patches.

Papulosum: A dermatitis marked by an eruption of discrete or aggregated reddish excoriated (to scratch off the skin) papules.

Parasiticum: Eczematous eruption precipitated by parasite infestation.

Pustulosum: A later stage of vesicular eczema in which the vesicles have become secondarily infected; the lesions become covered with purulent crusts.

Stasis: Eczematous eruption on the legs due to or aggravated by vascular stasis (blood stagnation).

Tropical: occurring in plaques on extensors of the extremities of common occurrence and unknown etiology (study of disease causes).

Varicose: Occurring over areas in which the skin has been compromised by varicosities.

Weeping: A moist, eczematous dermatitis.

Winter: Resulting from accelerated evaporation of moisture (including sweating) from the cutaneous surface; occurs as dry cracked plaques, usually on the extremities, but not infrequently also on the trunk in any season under circumstances (occupational, environmental) of excessively rapid drying out of the skin.