Staying up late causes itchy bumps on the body.

Itching and rashes appearing on the body after staying up late may be caused by dry skin, lack of sleep, insect bites, allergic reactions, folliculitis, or other reasons. These symptoms can be relieved through general treatments, medications, and other methods. If physical discomfort occurs, it is recommended to seek medical attention promptly.

1. Dry skin: Staying up late may cause the body to lose moisture, leading to dry skin. Prolonged lack of hydration can result in rashes accompanied by itching. It is important to maintain proper skin moisturization using hydrating lotions and creams. Additionally, increase water intake to prevent dehydration.

2. Sleep deprivation: Insufficient sleep may impair immune system function, causing abnormal bodily responses to stimuli. Adjusting sleep schedules and ensuring adequate rest can help alleviate symptoms.

3. Insect bites: When staying awake late at night, one may be bitten by insects, resulting in localized rashes and itching. Take preventive measures against mosquitoes, such as using mosquito nets or insect repellents. After being bitten, products like floral water (e.g.,花露水) can be applied to improve symptoms and relieve itching.

4. Allergic reactions: Staying up late may reduce immunity, increasing sensitivity to certain allergens and triggering allergic reactions. Avoid known allergens and follow a doctor's advice in using antihistamines or anti-allergy medications, such as calamine lotion, hydrocortisone cream, or vitamin C tablets.

5. Folliculitis: Chronic late-night habits can weaken immunity. If skin hygiene is poor or there are open wounds, pathogens may invade and infect hair follicles, leading to folliculitis. Maintain good skin cleanliness and avoid skin injuries. Under medical guidance, antibiotic treatments such as erythromycin ointment, mupirocin ointment, or cefuroxime axetil granules may be used.

In daily life, try to ensure sufficient sleep and establish regular作息 habits. Maintain a light diet and avoid spicy or irritating foods such as chili peppers and Sichuan pepper to reduce skin irritation.