The reddish chin of pregnant women may be caused by endocrine disorders, eczema, contact dermatitis and other reasons. 1. Endocrine disorders: elevated levels of estrogen in pregnant women may lead to capillary expansion in the chin area, which can be manifested as a red chin. 2. Eczema: due to immune disorders during pregnancy, eczema is also prone to occur, often manifested in erythema on the basis of pimples, papules, so, at the beginning of the disease, can be manifested as a red chin. 3. Contact dermatitis: If the chin is exposed to allergenic substances, the mild reaction can be manifested as erythema and papules. It is recommended that pregnant women with a red chin go to the hospital in time to clarify the cause, and if treatment is needed, standardized treatment should be carried out under the guidance of the doctor.