Red bumps on the sides of the waist may be related to diseases such as urticaria, insect bite dermatitis, boils and shingles. 1. Urticaria: localized skin will appear in the size of the wind, commonly in the trunk, limbs and other parts. The cause may be related to infection, mental, autoimmune and other factors. 2. Insect bite dermatitis: the cause is mainly related to the allergic reaction to insect bites. The patient will have localized symptoms such as red bumps, blisters and swelling. 3. Boils: the cause is mostly related to Staphylococcus aureus infection. Patients may develop single or multiple red, painful localized nodules, which may occur anywhere on the body. 4. Herpes zoster: the cause is mainly related to varicella-zoster virus infection. Patients will appear blisters, papules and other symptoms, surrounded by redness, preferably in the waist and other places. There are more reasons for the red bumps on both sides of the waist, it is recommended to go to the regular hospital for examination and to clarify the cause of the disease.