The causes of two pieces of black flesh on labia minora include endocrine disorders, melanoma, pigmented nevus, and post-inflammatory hyperpigmentation. 1. Endocrine disorders: when married women have sex, due to the increase in estrogen production, there can be an increase in the production of melanin in the labia minora, so the black flesh appears. 2. Melanoma: If various factors trigger the abnormal proliferation of melanocytes, the phenomenon of two pieces of black flesh on labia minora will also appear. 3. Pigmented nevus: due to the increase of melanocytes in the skin triggered by genetic and environmental factors, the phenomenon of darkening of the labia minora can occur. 4. Post-inflammatory hyperpigmentation: when dermatitis eczema and other diseases occur in the labia minora, pigmentation may remain after healing, which can also be manifested in the labia minora with two pieces of black flesh. Finally, the appearance of the labia minora have two pieces of black meat phenomenon, please consult a doctor in time.