Dissociation, in the wide sense of the word, is an act of disuniting or separating a complex object into parts. Dissociation may also refer to:

Dissociation (chemistry), general process in which molecules or ionic compounds (complexes, or salts) split into smaller particles, usually in a reversible manner
Dissociation (neuropsychology), identification of the neural substrate of a particular brain function through various methods
Dissociation (psychology), an experience of having ones attention and emotions detached from the environment
Dissociation (rhetoric), a rhetorical device in which the speaker separates a notion considered to form a unitary concept into two new notions to affect an audience in some way
Dissociation (album), by the Dillinger Escape Plan, 2016

See also
Dissociation: Progress in the Dissociative Disorders (1988-1997) published by International Society for the Study of Trauma and Dissociation
"Disassociation", a 2021 song by the Rions
Dissociative, a class of hallucinogen
All pages with titles beginning with Dissociation
All pages with titles containing Dissociation
An exanthem is a widespread rash occurring on the outside of the body and usually occurring in children. An exanthem can be caused by toxins, drugs, or microorganisms, or can result from autoimmune disease. The term exanthem is from the Greek ἐξάνθημα, exánthēma, a breaking out. It can be contrasted with enanthems which occur inside the body, such as on mucous membranes. Infectious exanthem
In 1905, the Russian-French physician Léon Cheinisse (1871–1924), proposed a numbered classification of the six most common childhood exanthems.Of these six "classical" infectious childhood exanthems, four are viral. Numbers were provided in 1905.The four viral exanthema have much in common, and are often studied together as a class. They are:

Scarlet fever, or "second disease", is associated with the bacterium Streptococcus pyogenes. Fourth disease, also known as "Dukes disease" is a condition whose existence is not widely accepted today. It was described in 1900 and is postulated to be related to the bacterium Staphylococcus aureus.In 1979 and 2001 a possible "seventh diease" was postulated following reports of a condition in Japan also referred to as acute febrile infantile mucocutaneous lymph node syndrome (MCLS).Many other common viruses apart from the ones mentioned above can also produce an exanthem as part of their presentation, though they are not considered part of the classic numbered list:

Varicella zoster virus (chickenpox or shingles)
Mumps
rhinovirus (the common cold)
unilateral laterothoracic exanthem of childhood
Some types of viral haemorrhagic fever are also known to produce a systemic rash of this kind during the progression of the disease.