Small red bumps appearing on the body for no apparent reason, similar to mosquito bites, but without pain or itching.

Small, mosquito-bite-like red bumps appearing on the body without any obvious cause, and which are neither painful nor itchy, may result from physiological factors or pathological conditions such as insect bites or chronic urticaria. Treatment options include general management and medication. Specific details are as follows:
　　I. Physiological Factors
　　If a person remains in a damp, enclosed environment for a prolonged period, it may affect the body and lead to the appearance of red bumps. It is important to frequently open windows for ventilation and maintain good indoor air circulation.
　　II. Pathological Factors
　　1. Insect Bites
　　Mosquitoes typically pierce the skin with their mouthparts, causing an allergic skin reaction and resulting in red patches. Under a doctor's guidance, topical application of erythromycin ointment or oral administration of levocetirizine hydrochloride capsules may be used for treatment.
　　2. Chronic Urticaria
　　This condition is mainly caused by various stimuli leading to congestion and edema of blood vessels in the skin and mucous membranes. After an episode of chronic urticaria, patients may develop red welts without pain or itching. Medications such as urticaria pills or cyproheptadine hydrochloride tablets may be used as directed by a physician.
　　In addition to the above causes, such bumps could also be due to sebaceous cysts, psoriasis vulgaris, or hemangiomas. Adequate rest should be taken and excessive fatigue avoided.