Dark spots on armpits may be caused by friction melanosis, lichen planus and pseudoacanthosis nigricans.
1. Friction melanosis: if the patient’s underarms are subjected to mechanical stimulation such as clothing friction for a long period of time, resulting in hyperpigmentation, there will be black spots in the underarms and other symptoms.
2. lichen planus: lichen planus is a common superficial fungal infectious disease of the skin, mainly due to the uncontrolled growth of fungi naturally existing on the underarm skin, which can lead to the formation of gray-brown and black spots on the local skin.
3. Pseudoacanthosis nigricans: also known as obesity-related acanthosis nigricans, obesity is the most common cause, is a kind of benign skin disease related to endocrine disorders, melanocyte function abnormalities, there will be symmetrical distribution of hyperpigmentation, which can be manifested as the appearance of black spots in the armpits.
When the patient’s armpits appear black spots, it is recommended to go to the hospital in time for examination and diagnosis, and choose the corresponding treatment under the guidance of the doctor.