| | Conditions & Treatments | Rashes Why do chancre sores take a week to heal? Chancre sores usually appear 10-90 days after exposure to syphilis bacteria and typically heal within 3-6 weeks without treatment. Rashes - Related Articles What would a skin rash look like if you had sensitivity to chemical in pool? What Triggers Hidradenitis Suppurativa? Can Listerine Psoriasis Patches? Does Captiva Stretch Mark Cream Work? Granuloma Annulare in Babies Natural Cures for Guttate Psoriasis How to Treat & Prevent Skin Rashes