Why brown spots form, and what you need to know
Brown spots (also called age spots, sun spots, solar lentigines, hyperpigmentation) appear when the skin’s pigment-cells (melanocytes) produce extra melanin in certain areas. Some key triggers:

Sun exposure / UV radiation. The skin responds by increasing melanin as a protective pigment. Healthline+3RosyCheeked+3Wellness.guide+3

Aging. Over time, the mechanism for melanin regulation becomes less even, so spots accumulate.

Hormonal changes. Melasma or hormone-related pigment changes can contribute.

Inflammation or skin damage (injury, acne) can lead to post-inflammatory hyperpigmentation.

Genetic or skin-type factors (darker skin tones may develop noticeable spots differently).

Because sun exposure is a major cause, prevention is a major part of treatment: daily sunscreen, hats, avoiding peak UV, etc. Without sun protection, whatever remedy you use may be less effective or the spots may worsen. Reddit+1
Also: home remedies can help lighten or fade the appearance of spots — but they work slowly, results vary, and they are complementary to professional treatments (laser, chemical peels, prescription topical agents) when needed. RosyCheeked+2Wellness.guide+2

With that background, let’s explore the two-ingredient hack.

The Two-Ingredient Hack: Lemon Juice + Raw Honey