Common causes of multiple raised hard bumps on the back include sebaceous cysts, insect bite dermatitis, acne or folliculitis, boils and so on.
1. Sebaceous cysts: This disease is mainly caused by improper diet, lack of attention to hygiene, trauma, genetics and other factors, resulting in sebum excretion obstruction, the formation of retention cysts. It is characterized by a spherical cystic swelling under the skin, medium hardness, elasticity, smooth surface and other symptoms.
2. Insect bite dermatitis: this disease is caused by mites, mosquitoes, midges, bedbugs, fleas, ticks and other insect bites or venomous sap stimulation. The skin lesions show symptoms such as pinpoint bite marks, conscious itching, wind bumps, pimples, blisters, and bloody scabs. Occurring on the back, they look like multiple raised hard bumps.
3. Acne or folliculitis:Acne or folliculitis occurs in areas with abundant sebaceous glands, preferably on the back, and often develops into boils and cysts as the disease progresses, which are hard and appear as multiple raised hard bumps.
4. boils: boils are caused by acute bacterial infections of the hair follicles and their surrounding tissues, and are most common on the back, with lesions of single follicle nodules or even pustules, redness, swelling and pain.
It is recommended that patients go to the dermatology department of a regular hospital to get a clear diagnosis and follow the doctor’s instructions for active treatment to avoid delaying the condition.