A fungal disease is a disease caused by a fungus. Fungal disease, apart from common by skin and nail ailments such as athlete's foot, tinea cruris. and ringworm, develop especially in people with disorders of immunity or diabetes and those taking certain drugs (steroids, immunosuppressants, antibiotics). Thrush is common in the mouth and vagina but rarely causes systemic disease. Specific fungal diseases occur in some areas (e.g., histoplasmosis, blastomycosis) while aspergillosis often complicates chronic lung disease. In addition, numerous fungi in the environment lead to forms of allergy and lung disease.