Rose spots are red macular lesion

Lesion

A lesion is any abnormality in the tissue of an organism , usually caused by disease or trauma. Lesion is derived from the Latin word laesio which means injury.- Types :...

s 2-4 millimeters in diameter occurring in patients suffering from enteric fever (which includes typhoid and paratyphoid). These fever

Fever

Fever is a common medical sign characterized by an elevation of temperature above the normal range of due to an increase in the body temperature regulatory set-point. This increase in set-point triggers increased muscle tone and shivering.As a person's temperature increases, there is, in...

s occur following infection by Salmonella typhi and Salmonella paratyphi respectively. Rose spots may also occur following invasive non-typhoid salmonellosis

Salmonellosis

Salmonellosis is an infection with Salmonella bacteria. Most people infected with Salmonella develop diarrhea, fever, vomiting, and abdominal cramps 12 to 72 hours after infection. In most cases, the illness lasts four to seven days, and most people recover without treatment...

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Rose spots are bacterial emboli to the skin and occur in approximately 1/3 of cases of typhoid fever. They are one of the classic signs of untreated disease, but can also be seen in other illnesses as well including shigellosis and nontyphoidal salmonellosis. They appear as a rash

Rash

A rash is a change of the skin which affects its color, appearance or texture. A rash may be localized in one part of the body, or affect all the skin. Rashes may cause the skin to change color, itch, become warm, bumpy, chapped, dry, cracked or blistered, swell and may be painful. The causes, and...

between the seventh and twelfth day from the onset of symptoms. They occur in groups of five to ten lesions on the lower chest and upper abdomen, and they are more numerous following paratyphoid infection.
Rose spots typically last three to four days.