Is syphilis rash flat or raised?

Generally speaking, syphilis rashes are morphologically diverse; they can be flat or raised, and their specific manifestations vary depending on the type. If any abnormalities are noticed, prompt medical attention is recommended. Detailed analysis is as follows:

Some syphilis rashes appear as macules, presenting as flat skin lesions. These macular syphilis rashes are typically red or reddish-brown patches ranging from 0.5 to 1 centimeter in diameter, flush with the skin surface, and generally do not feel raised upon touch. They commonly occur on the trunk and proximal limbs. The macules have uniform coloration and may leave slight pigmentation after fading. Due to their subtle appearance, they are easily overlooked and require careful observation for detection.

Another type of syphilis rash is papular, presenting as raised skin lesions. Papular syphilis rashes are 1-2 centimeters in diameter, round or oval in shape, firm in texture, and distinctly elevated upon touch. They can appear anywhere on the body, including the palms and soles. Some papules may have a scaly surface or develop into flat moist warts due to specific infections; these raised rashes are more typical.

If abnormal skin rashes appear—whether flat or raised—and there is a history of unsafe sexual contact or suspected exposure to syphilis, immediate consultation with a dermatologist at a hospital for syphilis serological testing is advised.