1A skin injury caused by heat, chemicals, or friction. 火傷 is normally read やけど; the on-yomi reading かしょう is a clinical/medical term used in diagnostic reports, medical literature, and other specialized written contexts, and is almost never used in conversation.
診断書には「全身の約三十パーセントに火傷」と記載されていた。
The medical report stated that burns covered roughly thirty percent of the body.
重度の火傷の治療には長期の入院が必要となることが多い。
Treatment of severe burns often requires a long hospital stay.