In general, the severity of a rash and fever does not relate to the
severity of an illness. It is more important to assess how ill a person feels
or is behaving. An unexplained rash that looks like bruises (purpura) or blood
spots under the skin (petechiae) and that occurs with fever and signs of
illness may indicate a serious infection or medical condition that requires
immediate medical care. Prompt medical treatment may prevent serious
complications and even loss of life.
A sunburnlike rash that starts 2 days after a fever of
102°F (38.9°C) or more may be
caused by a rare condition called
toxic shock syndrome.
A rash and fever may occur with conditions such as a local skin
infection or a viral illness, such as a cold, the flu, strep throat, or
mononucleosis.
A health professional can evaluate your symptoms and recommend
treatment.