Itchy skin that comes out when you scratch it may be suffering from scabies, eczema or ringworm. 1. Scabies: Boils are a contagious skin disease caused by scabies mites parasitized on the skin, and are found on the finger cracks, breasts, armpits, lower abdomen, etc. There are blisters and pimples elevated on the skin, which are often accompanied by itching, and can be treated by applying sulfur ointment on the affected areas. 2. Eczema: the cause of eczema is still unclear, manifested as pinheads or rice-like reddish pimples on the skin, blisters and pustules will appear in serious cases, can be oral levocetirizine, loratadine and other drugs treatment. 3. ringworm: ringworm is caused by pathogenic fungi parasitized on the human body’s smooth skin superficial skin fungal infections, fungi in the invasion of the site to produce pinhead-sized herpes or mounds of herpes, the patient is conscious of the itching, the rash is easy to scratch the water. Naftifine ketoconazole cream and other antifungal drugs can be used externally. All of the above drugs should be used in accordance with medical advice. There may be other reasons for the itchy skin, so we suggest that the patient go to the dermatology department and get a clear picture of the cause of the disease and then treat the symptoms.