Sometimes, grey warts will appear instead of sores, accompanied by a rash on the palms of the hands and feet.
Flu-like symptoms are also common, as are headaches, tiredness, swollen glands and patchy hair loss on the head.
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Lenstore’s optometrist expert, Roshni Patel, explained: “Syphilis is an STI that can cause rashes and sores to appear on the body.
“Affecting the whole body once infected, the virus can cause damage that often can’t be preserved by treatment if caught too late.
Source: Daily Express