Final answer:
When a roofer develops hyperpyrexia after working in the hot sun, their skin may become blotchy and red, and feel dry and tight.
Step-by-step explanation:
When a roofer spends eight hours in the hot sun installing replacement shingles, there is a possibility of developing hyperpyrexia, which is an elevated body temperature. As a result, the skin may become blotchy and red. This is due to increased blood flow to the skin's surface in an attempt to dissipate heat. Additionally, the skin may feel dry and tight as excessive sweating can lead to dehydration.