Moxibustion on the fire and then continue to do

The more you moxibustion, the more fire you may get, moxibustion itself is a pungent and warm drug, is a pungent and dry thing, the role of warm meridian is very strong, for the deficiency of cold, and moxibustion is to warm stimulation effect on the body, so some people are prone to signs of fire. What are the signs of fire?