Detailed answer

Melasma and nevus of Ota are both conditions that cause hyperpigmentation, but they have different characteristics. Melasma typically appears as symmetrical brown patches on the face, particularly on the forehead, cheeks, and upper lip. It is triggered by hormonal changes, sun exposure, and certain medications. On the other hand, nevus of Ota is a congenital condition that presents as bluish-gray patches on one side of the face, including the eye area. It is caused by the accumulation of melanin in the dermis. While both conditions can have similar pigmentation, the distribution and underlying causes differ. It is important to consult a healthcare professional or dermatologist for an accurate diagnosis and appropriate treatment.