A piece of skin suddenly turns yellow, which may be related to trauma, ultraviolet radiation, hyperpigmentation and other conditions.
1. Trauma: when the patient’s skin is hit by external forces, it will make the subcutaneous capillaries rupture and there will be subcutaneous bruising. The color may be bright red, greenish-purple, etc. With the absorption of local bruises, it will gradually become light yellow and eventually return to normal skin color.
2. Ultraviolet radiation: If the skin is exposed to strong sunlight, the sunlight will lead to skin injuries and the formation of yellow, red or blackened patches, accompanied by tingling or itching.
3. Hyperpigmentation: the typical symptom of skin patches, a variety of reasons can lead to hyperpigmentation, such as endocrine disorders, metabolic diseases, or taking some kind of medication with yellow pigmentation, but also due to the local had eczema, dermatitis and other inflammatory diseases caused.
There are many other reasons why a piece of skin suddenly turns yellow, if there is a big impact, the patient should go to the dermatology department in time to clarify the cause, and by the doctor’s guidance standardized treatment.