no, eating raw sugar will give the same symptom.
By Eating out an infected vagina or if you pop the clitoral oils and the vaginal juices burts.
You get syphilis from unprotected sex. Still if you have a condom or something like that DO NOT have sex with that person who has syphilis.
It will eventually kill you, but it is a bacterial infection-so it can be easily treated with antibiotics.
Syphilis is an STD [sexually transmitted disease] and a very dangerous one. unless treated it will kill after it has rotted your brain.