A hot towel is the perfect way to open your pores, reduce muscle pain or simply relax after a long day. With the addition of a few drops of essential oil, a hot towel becomes even more relaxing and therapeutic. You can heat the towel in the microwave for a hot towel spa or barber treatment at home, but it is important to heat them correctly and safely. You can also use the microwave to heat the water and then apply it to the towel if heating a towel in the microwave makes you nervous.