Acne may be caused by acne, folliculitis and other diseases, and spots may be caused by chloasma, freckles and other diseases. 1. Acne: The cause may be related to factors such as changes in androgen levels and large amounts of sebum secretion. Patients will have localized pimples, pustules and other symptoms, which are commonly found on the cheeks, jaws and other parts of the body. 2. Folliculitis: the cause of the disease is mainly related to bacterial, fungal and other pathogenic infections, friction of the skin, excessive sweating and other reasons may also trigger the disease. Red papules will appear locally, which can be seen on the head, face, thighs and other parts of the body. 3. Chloasma: the cause of the disease is still unclear, which may be related to heredity, ultraviolet radiation, hormone level changes and other factors. It mainly manifests as light brown or dark brown spots and patches on the face. 4. Freckles: the cause may be related to heredity, light exposure and other factors. Patients will have localized lesions of the size of a needle tip or a grain of rice, which are light brown or dark brown in color, and preferably occur on the face. If the phenomenon of acne and freckles on the face occurs, it is recommended to go to regular hospitals for consultation and examination, so as to clarify the cause of the disease.