Yes, it is possible to send a disappearing photo on iMessage. This feature is called "Disappearing Photos" and it is available on iOS 13 or later.
Here are the steps to send a disappearing photo on iMessage:
1. Open the Messages app on your iPhone running iOS 13 or later.
2. Tap on the conversation where you want to send the disappearing photo.
3. Tap on the camera icon to open the camera app within the Messages app.
4. Take a photo or select an existing photo from your camera roll.
5. Tap and hold the send button (the arrow pointing up) and select "Send as disappearing photo".
6. Once the recipient opens the photo, it will disappear after a few seconds.
It's important to note that if the recipient takes a screenshot of the disappearing photo, you won't be notified. This feature is meant to provide a sense of privacy and security when sharing sensitive photos, but it's not foolproof. As always, exercise caution when sharing sensitive content.