The causes of itchy skin include papular urticaria, eczema, contact dermatitis, mosquito bites, etc. Treatment includes medication. 1. papular urticaria: this disease is due to a variety of factors lead to the expansion of small blood vessels in the skin and increased permeability triggered by the rash, at this time can be given to ebastine and other drugs antihistamine treatment. 2. Eczema: eczema is due to a variety of internal and external factors leading to inflammatory reactions in the skin, at this time you can give glucocorticoid ointment such as dinexed, halomethasone, etc. to anti-inflammatory treatment. 3. Contact dermatitis: this disease is due to contact with irritating substances triggered by skin inflammation, at this time you can give loratadine and other drugs antihistamine treatment. 4. Mosquito bites: if mosquito bites, you can use cetirizine tablets and other drugs to anti-allergy itch. Finally, there are more reasons for itchy skin scratching small rice grains, it is recommended to consult a doctor in a timely manner, the above drugs must follow the doctor’s instructions.