There is no one-size-fits-all solution for dark spots and pigmentation on the face. The best approach is to visit a dermatologist to get a personalized treatment plan that is tailored to your specific needs. The dermatologist may recommend a combination of topical medications, light treatments, and laser therapy to help minimize the appearance of discoloration.

A canker sore­ might trouble your mouth. They are small, round, and painful sore­s. Stress, spicy foods, or biting your cheek can cause­ them. Try over-the-counte­r rinses or gels to ease­ pain and speed healing. Soft foods are­ better; avoid spicy or acidic ones. Give­ it time - around one or two wee­ks - and it should disappear on its own.

You might have a medical condition named acanthosis nigricans. It can sometimes cause the lower face to be darker than the rest. It's not dangerous but could be a sign of something more serious, like insulin resistance, that is happening inside your body. You can fix this by eating cleaner, being active, and maintaining skin health. Furthermore, consume a lot of water. 

You need to visit dermatologist immediately if your child is experiencing rashes and itching due to handling pets. Depending on the severity of the reaction, the doctor may prescribe an anti-itch cream or an oral medication. By that time keep the area clean and dry. avoid touching the rabbits until the rash has cleared. Ensure that the rabbits are healthy and free of any parasites or other conditions that could have caused the reaction. Use gloves in the future when handling them.

Pigmentations are due to various reasons, Have to find out the underlying cause and treating the cause would be the primary approach Along , will start with depigmenting cream and sunscreens. Would suggest - Peels ,hydrafacial MD to see faster results. You can also visit the dermatologist near your place or have a video consultation with best dermatologist in Jodhpur Lake, Kolkata. Hope this answer helps you.