It is the only efflorescence which is located on the level of the skin; it predominantly involves rather a color change than a change in consistence.
Examples:
Change in the fill state of the blood vessel
- Roseola
lentil-sized spots as the result of vasodilatation;
MORBILLI, TYPHUS, LUES
- Enanthema
widely spread multiple efflorescences;
ALLERGIC REACTION
Bleeding (extravasation) into the tissue
- Purpura
dot-like exanthematic spread; AGRANULOCYTOSIS, COAGULATION ABNORMALITIES
- Vibices
strip-like spread;PLAGUE
- Petechiae
pinhead-sized dots;FLU
- Ecchymosis
extensive irregular hematoma;TRAUMA
Endo- or exogenous pigments
- Nevus
moles, freckles
- Tattoo
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