Elderly people with itchy skin that is bruised when scratched may be due to purpura. It can also be dermatitis long-term use of hormone creams lead to skin atrophy, increased vascular fragility produced. 1. Purpura: generally due to red blood cells from capillary extravasation, in the skin and mucous membranes cause petechiae hemorrhagic disease, manifested in the skin and mucous membrane bleeding, itchy skin, cyanotic plaques and other symptoms. The elderly purpura is the elderly blood vessel brittleness increases, the friction of itching and scratching damage and the appearance of subcutaneous petechiae, generally without treatment. 2. long-term application of hormonal drugs: dermatitis long-term hormonal creams lead to skin atrophy, increased vascular fragility produced, can also lead to the elderly itchy skin a scratch on the green piece. Elderly itchy skin a scratch on the green piece of advice in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor for symptomatic treatment.