Its source is from the slough shed by the cicada, Cryptotympana pustulata Fabricius, family Cicadidae. The medicinal material is collected in summer, the clean crude form is dried in the sun for medication.

Medicinal Properties:
Sweet in flavor, cold in nature and attributive to the lung and liver meridians.

Actions:
Expel wind and heat, let out the skin eruption and alleviate itching, improve eyesight and remove nebula, and stop wind and relieve convulsion.

Application
1. It is indicated for the wind-heat syndrome due to exogenous attack and seasonal febrile disease at the early stage marked by fever and hoarseness.
2. It is indicated for unsmooth eruption of measles and rubella with itching.
3. For conjunctivitis and pterygium.
4. For infantile convulsion and tetanus.