Here are some general ways to get rid of black colour on the skin:
1. Use a gentle exfoliating scrub: Regular use of an exfoliating scrub can help to remove the top layer of dead skin cells, revealing fresh, new skin underneath.
2. Apply lemon juice: Lemon juice is a natural bleaching agent and can help to lighten dark skin. Squeeze some lemon juice onto a cotton ball and apply it to the affected area.
3. Use a skin lightening cream: There are many over-the-counter skin lightening creams available that can help to fade dark areas of skin.
4. Avoid tight clothing: Wearing tight clothing can cause friction and irritation, which can lead to darkening of the skin in sensitive areas.
5. Keep the area moisturized: Keeping the skin well moisturized can help to prevent dryness and irritation, which can lead to darkening of the skin. Use a gentle, fragrance-free moisturizer daily.
Please consult a dermatologist before trying any of the above methods, especially if you have sensitive skin or a skin condition.