Acne scars and pigmentation can be treated with topical creams, chemical peels, and laser therapy, depending on the severity of the condition. You must consult a dermatologist for correct diagnosis and treatment plan.

Consult with your doctor before you start taking any new supplement. There are several options available if you are looking for natural ways to lighten dark knuckles. You can try exfoliating the affected area with a gentle scrub, apply lemon juice, or using a product that contains natural bleaching ingredients such as aloe vera, papaya, and turmeric.

I would recommend that you take your daughter to see a dermatologist for a full assessment. A dermatologist can provide the best advice on how to care for your daughter's skin condition, as well as prescribe any necessary medications and treatments. Be sure to use gentle soaps and moisturizers and avoid harsh chemicals or fragrances.

Fungal infections can lead to an itchy rash in the vaginal and thigh area. The warm and humid climate is an ideal growth environment for fungi. Keep the area dry and clean. You can use antifungal creams available over the counter to help clear it up. Moreover, wearing loose and breathable clothes is also important. 

Without a proper evaluation and diagnosis, it is difficult to understand the cause of the problem. I suggest taking your mother to a right doctor. Based on your mother's medical history and certain evaluations, he will be able to know the cause of burning feet and hands and can suggest an appropriate treatment. Hope this proved helpful.