These characteristically have a superficial perivascular inflammatory infiltrate and can be classified by type of cell infiltrate:Lymphocytic (most common)
Lymphoeosinophilic
Lymphoplasmacytic
Mast cell
Lymphohistiocytic
Neutrophilic

Terminology
There are several types of dermatitis including atopic dermatitis, contact dermatitis, stasis dermatitis and seborrhoeic dermatitis. Many authors use the terms dermatitis and eczema synonymously, and various dictionaries that treat the terms as differentiable nonetheless do not provide explicit criteria for differentiating them, as the aspects of inflammation, pruritus, and either exogenous or endogenous provoking agent all can apply to either term, and thus autoimmune components are not excluded from either. Others use the term eczema to specifically mean atopic dermatitis. Atopic dermatitis is also known as atopic eczema. In some languages, dermatitis and eczema mean the same thing, while in other languages dermatitis implies an acute condition and eczema a chronic one. Common types
Diagnosis of types may be indicated by codes defined according to International Statistical Classification of Diseases and Related Health Problems (ICD). Atopic
Atopic dermatitis is an allergic disease believed to have a hereditary component and often runs in families whose members have asthma. Itchy rash is particularly noticeable on the head and scalp, neck, inside of elbows, behind knees, and buttocks. It is very common in developed countries and rising. Irritant contact dermatitis is sometimes misdiagnosed as atopic dermatitis. Stress can cause atopic dermatitis to worsen.
Uridine 5-diphospho-glucuronosyltransferase (UDP-glucuronosyltransferase, UGT) is a microsomal glycosyltransferase (EC 2.4.1.17) that catalyzes the transfer of the glucuronic acid component of UDP-glucuronic acid to a small hydrophobic molecule. This is a glucuronidation reaction.Alternative names:

glucuronyltransferase
UDP-glucuronyl transferase
UDP-GT

Function
Glucuronosyltransferases are responsible for the process of glucuronidation, a major part of phase II metabolism. Arguably the most important of the Phase II (conjugative) enzymes, UGTs have been the subject of increasing scientific inquiry since the mid-to-late 1990s. The reaction catalyzed by the UGT enzyme involves the addition of a glucuronic acid moiety to xenobiotics and is the most important pathway for the human bodys elimination of the most frequently prescribed drugs. It is also the major pathway for foreign chemical (dietary, environmental, pharmaceutical) removal  for most drugs, dietary substances, toxins and endogenous substances. UGT is present in humans, other animals, plants, and bacteria. Famously, UGT enzymes are not present in the genus Felis, and this accounts for a number of unusual toxicities in the cat family. The glucuronidation reaction consists of the transfer of the glucuronosyl group from uridine 5-diphospho-glucuronic acid (UDPGA) to substrate molecules that contain oxygen, nitrogen, sulfur or carboxyl functional groups. The resulting glucuronide is more polar (e.g. hydrophilic) and more easily excreted than the substrate molecule. The product solubility in blood is increased allowing it to be eliminated from the body by the kidneys. Diseases
A deficiency in the bilirubin specific form of glucuronosyltransferase is thought to be the cause of Gilberts syndrome, which is characterized by unconjugated hyperbilirubinemia.