• An initial sharp sting or no immediate pain
• Pain developing within the first several hours after being bitten, possibly becoming severe
• General feeling of discomfort, malaise, or nausea
• Formation of an ulcer in the area of the bite
• Chills or fever
• Sweating
• Reddish to purplish color to skin area around bite
• Itching
• Red or purplish blister

In rare cases:

• Blood in urine
• Jaundice
• Kidney failure
• Seizures
• Coma