Itchy skin on hot days may be caused by dry skin, mosquito bites or prickly heat, which can be treated with topical ointment or oral medication according to the cause. 1. Dry skin: summer weather is hot, the skin is easily dehydrated, dry, causing itchy skin symptoms, such a situation, you can apply moisturizing ointment, such as urea cream or glycerin, etc., and at the same time to protect the skin barrier, do not over-clean, and do a good job of skin care. 2. Mosquito bites: summer is the most active season of mosquitoes, if the mosquito bites, the skin will appear itchy symptoms, you can apply cool oil, eau de toilette to stop itching. Want to prevent mosquito bites, you can set up mosquito nets, wear mosquito repellent bracelets or spray mosquito repellent drops. 3. Prickly heat: Happens in summer, due to the high temperature and sultriness of sweat evaporation is limited, retained to form prickly heat, can also cause itchy skin. At this time, you need to keep the room ventilated and cool, keep the skin clean and dry, you can use glycerin lotion, prickly heat powder and other drugs. If itchy skin occurs on hot days, it is recommended to consult a doctor to identify the cause of the problem and carry out targeted treatment or therapy. The medications mentioned above should be used in accordance with medical advice.