Here are a few ideas that might work:
1. Abstract Representation:
* A stylized flame: This could represent the inflammation and pain associated with "-itis."
* A swirling, red and orange cloud: Similar to the flame, this could represent the general concept of inflammation.
* A hand grasping at a glowing, painful spot: This emphasizes the physical experience of inflammation.
2. More Specific Representation:
* A picture of a swollen joint: "-itis" often refers to inflammation of specific body parts, like arthritis (inflammation of joints).
* A person with a red, irritated eye: Conjunctivitis (pink eye) is a common example of "-itis."
* A close-up of a rash: Dermatitis is another example of inflammation, this time of the skin.
3. Funny or Humorous:
* A cartoon character with a huge, swollen foot: This could be a lighthearted way to illustrate "-itis."
* A person with a giant bandage over their entire body: This could be humorous and emphasize the idea of widespread inflammation.
Ultimately, the best picture for the suffix "-itis" will depend on the specific context and audience you're trying to reach.