Rash
A rash was any change to an individual's skin which affected its appearance or texture. A rash could often be the symptom of an illness.

In 2370, Beverly Crusher initially believed that a mark on Deanna Troi's shoulder was a rash from the coil brace Data had stabbed her with; it ultimately turned out to be an interphasic organism. ()

In 2371, Ishka suffered a slight rash due to her skin being a little sensitive to clothing. This therefore did not constitute a medical ground for the FCA to drop their charges against her for earning profit. ()

In 2373, Kira Nerys had a rash on the back of her thighs, for which Miles O'Brien requested a salve from Julian Bashir. ()

Soon after, while attempting to woo Captain Kathryn Janeway, Q placed a romantic bed in her quarters, complete with satin bedsheets. Janeway, however, was not amused and ordered him to remove the bed, but Q refused, stating "I have no intention of getting between those Starfleet issue sheets. They give me a terrible rash." Janeway replied that it wouldn't matter, since he wouldn't be getting in the bed. ()

Also that year, The Doctor initially believed that skin markings upon Harry Kim were a rash, but which were in fact implanted Taresian genes. ()
 
Soon after, O'Brien asked Bashir if a rash were the cause of Kirayoshi's constant crying. ()

In 2374, while on board the , The Doctor claimed that one possible symptom of the Terothka virus was a rash. He said that some persons found the rash worse than the stomach cramps that could also result from the virus. ()

Also that year, Neelix claimed that Starfleet blankets gave him a rash, prompting Tuvok's suggestion, which the Talaxian interrupted, that he ask The Doctor for some anti-itch cream. ()

In 2378, Tuvok devolved a cutaneous eruption which The Doctor informed Neelix of, breaching doctor-patient confidentiality. Later that year, believing his destruction to be inevitable, The Doctor confessed this to Tuvok. As The Doctor survived, this incident became an embarrassment. ()

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Medical conditions