A 45-year-old woman with pimples all over her face may have acne, contact dermatitis and other causes. 1. Acne: is a follicular sebaceous gland unit of chronic inflammatory skin disease, people of all ages can develop, can be due to the body androgen secretion exuberance, sebum secretion hyperactivity, as well as follicular sebaceous gland duct keratinization, follicular Propionibacterium multiplication related. Secondly, and genetic factors, endocrine factors, emotional factors, dietary factors are also somewhat related, may lead to 45-year-old women face full of acne. 2. Contact dermatitis: the use of cosmetics, skin care products or contact with other allergenic substances, resulting in skin allergic reactions, leading to contact dermatitis, may also lead to 45-year-old women face full of pimples, mostly accompanied by skin erythema, itching and other symptoms. There may be other reasons why a 45-year-old woman’s face is full of pimples, so it is recommended that you go to the hospital to confirm the diagnosis and follow the doctor’s instructions for treatment.