What can the application of hot towels potentially cause?

The application of hot towels can potentially cause broken capillaries due to the heat's effect on the blood vessels in the skin. When heat is applied, it can cause blood vessels to dilate, which might lead to increased pressure within the capillaries. If the pressure exceeds what the vessels can handle, it can result in damage to the capillaries, leading to visible signs such as redness or bruising in the area where the hot towel was applied. This is particularly a concern for individuals with sensitive skin or existing vascular issues, as they may be more prone to such damage.

In contrast, the other options reflect positive outcomes commonly associated with the use of hot towels, such as increased blood circulation, muscle relaxation, and enhanced product absorption, which are beneficial effects but do not account for the potential risk of capillary damage.