Multiple choice

What do you call an open sore on the surface of the skin?

  1. keloid

  2. cicatrix

  3. urticaria

  4. ulcer

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An ulcer is an open sore on the skin or mucous membrane. Keloids and cicatrix are types of scar tissue, and urticaria refers to hives.