What is this condition - boy aged 5 symptoms include anhidrosis heat sensitivity and red yellow blotchy face occurs during exercise temps above 70 much faster 80 direct sunlight 70?

The condition you are describing is likely Malignant Hyperthermia (MH). MH is a rare, inherited disorder that can cause a life-threatening reaction to certain drugs used during surgery, including anesthesia. Symptoms of MH can include:

Sudden increase in body temperature

Muscle rigidity

Rapid heart rate

Sweating

Difficulty breathing

Nausea and vomiting

Confusion

Seizures

MH is triggered by specific drugs used during surgery, such as succinylcholine and volatile anesthetics. In people with MH, these drugs can cause a rapid increase in muscle metabolism, which leads to the symptoms of MH.

MH is a serious condition that can be fatal if not treated promptly. If you or your child have a family history of MH, it is important to inform your doctor before any surgery. There are tests that can be done to diagnose MH, and there are treatments that can be used to prevent and treat the condition.