The black spots after underarm hair removal may be scars, moles, sebaceous cysts, hyperpigmentation, etc. Treatments include laser treatment and surgery. 1. Scars: For black scars left after hair removal, laser treatment can be perfected under the guidance of doctors. 2. Moles: If the hair removal stimulates the skin to proliferate and form moles, it is necessary to choose laser mole removal or surgical excision under the diagnosis of the doctor. 3. Sebaceous cysts: Some sebaceous cysts only show the appearance of a black spot and may need to be examined by a doctor to improve surgical treatment. 4. Hyperpigmentation: In case of inflammatory hyperpigmentation after underarm hair removal, regular observation is usually needed, the color may fade with time, if there is no trend of fading, laser treatment can be perfected under the guidance of doctor. If the phenomenon of black spots after underarm hair removal occurs, it is recommended to go to the hospital in time for examination and treatment as prescribed by the doctor.