Black patches on the back may be caused by hyperpigmentation, florid furosemide, nevus nigricans, seborrheic keratosis and so on, and can be treated by laser and medication according to different causes.
1. Hyperpigmentation: Stronger ultraviolet rays in summer, daily inattention to sun protection and frequent exposure to ultraviolet rays can lead to localized melanin precipitation, resulting in black patches on the back. It may also be caused by local trauma, eczema, dermatitis and other diseases. It can be treated by topical hydroquinone cream or laser therapy under the guidance of a doctor.
2. maculopapular furuncle: when the patient sweats more and does not pay attention to cleanliness and hygiene, the malassezia bacteria will multiply, resulting in maculopapular furuncle, which can be manifested as gray, brown, dark brown almost black spots on the skin. It can be treated with topical medicines such as cyclopyrrolidine cream and ketoconazole cream under doctor’s guidance after clear diagnosis.
3. Melanoma: Melanoma is a kind of benign melanocyte aggregation at the junction of epidermis and dermis, the manifestation symptom is that there are black patches on the back, which can be treated by laser.
4. Seborrheic keratosis: this is a common clinical benign skin hyperplasia disease, which occurs in middle-aged and old people’s face, back of the hand, back and other parts of the face, presenting light brown patches, with smooth surface or slightly papillomatous, and can be black in old age. It can be treated by liquid nitrogen freezing and laser.
When patients have black plaques on their backs, it is recommended that they go to the hospital for treatment, and patients need to follow the doctor’s instructions to use medication so as not to delay their condition.