It is generally not recommended to use hydroquinone on the lips, as the skin there is very delicate and may get easily irritated. For Vitamin C, a serum or gel containing 10 to 20 percent L-ascorbic acid works well, or you can ask a dermatologist to recommend a formulation suited to your skin type.

Black patches on the forehead and under the eyes are commonly due to conditions like hyperpigmentation or melasma, which can be triggered by sun exposure, hormonal changes (especially after pregnancy), stress, lack of sleep, or nutritional deficiencies. Dark circles under the eyes can also be worsened by eye strain and fatigue. Treatment mainly focuses on protecting and caring for the skin: use a broad-spectrum sunscreen daily (even indoors), avoid direct sun exposure, and maintain good sleep and hydration. Gentle skin care with moisturizers and mild creams containing ingredients like vitamin C, niacinamide, or kojic acid can help lighten pigmentation over time. Avoid using harsh or over-the-counter steroid creams without medical advice. If the patches persist or worsen, consult a dermatologist, who may prescribe specific treatments like medicated creams or chemical peels. With consistent care, improvement is usually gradual but noticeable.