Margaret Hamilton, the Wicked Witch of the West, suffered …

Other actors endured struggles, although for some very different reasons. Margaret Hamilton, well known for her portrayal of the Wicked Witch of the West as a contrasting character to Garland’s sweet Dorothy Gale, suffered a second-degree burn on her face as well as a third-degree burn on her hand.

https://www.thevintagenews.com/2017/07/22/margaret-hamilton-the-wicked-witch-of-the-west-suffered-3rd-degree-burns-while-making-the-wizard-of-oz/