Can snakebeds be poisoned when applied externally?

Snake bed seed can be taken internally or externally, under the guidance of the doctor in the appropriate amount of external and will not be poisonous, but the snake bed seed has a small poison, the use of the process need to pay attention to not overdose.
Snake bed seed is hard and warm in nature, with a small poison, with insecticidal itching, dampness, wind, warm kidney and Yang’s role, the main treatment of eczema itching, scabies, itching, cold and wet belt, kidney impotence, dampness paralysis lumbago, uterine cold and infertility and other illnesses. It should not be taken internally for those who have a deficiency of yin and fire or those who have dampness and heat in the lower burner.
Although snakebeds have a small poison, it usually occurs in cases of overdose. Snake bed seed can be decocted, can also be used externally, most of the decoction of the soup fumigation or powdered dressing. So the appropriate amount of external application is generally not poisonous. Snake bed seed poisoning may appear mouth and tongue numbness, dizziness, palpitations, sweating and other manifestations, need to use snake bed seed under the guidance of a doctor.