Behind the waist, there is a piece of red like stretch marks with dandruff. It doesn't hurt or itch. Is it a skin disease?
Looking at the picture, it is considered as growth pattern, also known as expansion pattern. It is the elastic fiber of skin and dermis that is broken. It is common in thighs and waist. It has no impact on health. If it is not for beauty, it does not need treatment. However, growth lines generally do not have dandruff. Fungal infection is generally considered if there is dandruff. It is recommended to go to the hospital for examination and treatment after diagnosis.
If your skin is red like stretch marks and has a temper, the main consideration is caused by fungal infection. First of all, it is recommended that you pay attention to maintaining local skin, not too dry, and then pay attention to topical antifungal drugs.
First of all, from the picture symptoms, the problems caused by growth lines are not ruled out. Of course, it may also be caused by local dermatitis. It is recommended to apply some dermatitis drugs or butyric acid hydrogenated cream first. If it does not subside effectively, retinoic acid cream can be used for treatment.