The large black bumps on the back are considered to be caused by folliculitis, sebaceous cysts, melanoma and other diseases.
1. Folliculitis: a purulent inflammatory disease caused by Staphylococcus aureus infection of the hair follicles, which can lead to the appearance of red follicular papules on the local skin, and pustules can appear within a few days. The pustules can form yellow scabs when they dry up or break down, and sometimes they can form hyperpigmented scarring nodules, resulting in what looks like a black pimple.
2. Sebaceous cysts: also known as acne, mostly due to sebaceous gland duct obstruction, glandular content accumulation and formation. The main manifestation is the appearance of a round swelling on the skin, which may appear as skin color or light blue, brown, etc. The surface is smooth, and redness, swelling and pain may appear when secondary infection occurs.
3. Melanoma: also known as malignant melanoma, it is a disease caused by excessive proliferation of melanocytes, which can cause the patient’s skin to appear black spots or slightly elevated black pimples, and with the passage of time, the rash can be gradually expanded, and may even cause erosion and ulceration.
In addition, lipoma, hemangioma, vascular nevus, flat warts, etc. can also lead to the phenomenon of black bumps on the back, it is recommended that patients go to the hospital in time to find out the cause of the disease, and follow the doctor’s instructions for treatment.