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.
He also opines that he thinks half his children are freaks, blaming this and the fact that there were so many at once, on the fact that they were artificially inseminated. Carol Chase (Rebecca Creskoff) – The mother maintains the large family and house in "typical sitcom homemaker" mode. In one episode she attempts to go back to work, but nobody wants her because shes been raising kids for 15 years. She goes back to being a homemaker and remains one for the rest of the show. She enforces the house rules. Parker Chase (Jake McDorman) – The popular boy. Tallest of the children, good-looking, successful in academics and sports. He teases his brothers mercilessly, especially Pearce, but is also quick to defend them. The male quints share a deep bond, probably from sharing the womb. At one point the youngest and shortest, Patton, says that Parker took all the good genes and left him with the short ones and Pearce with the weird ones. Pearce Chase (Johnny K. Lewis) – The curly-haired weirdest quint. He boldly shares with anyone his strange perspective on just about any subject, and is so odd that he no longer responds to rejection. Penny Chase (April Matson) – The intellectual, who is vigorously nonconformist. Her taste in clothing and hairstyle frequently gets her mistaken for the typical goth. She enjoys reading and sometimes feels inadequate to Paige. Paige Chase (Sarah Wright) – The beautiful girl. She spends most of her time thinking of and attending to her appearance.