A red spot on the neck of a baby like ringworm may be caused by nevus erythematosus, or it may be caused by other diseases such as prickly heat, eczema, etc. The causes are different and the treatments are different. 1. nevus erythematosus: nevus erythematosus, also known as nevus of dilated capillaries, commonly known as red birthmarks, is caused by capillary malformations, usually present at the time of birth of the child, with the disease of the child can appear on the neck of a piece of red patches of ringworm-like manifestations, the treatment of surgical excision, laser therapy, photodynamic therapy and other ways to treat. 2. prickly heat: prickly heat is a skin disease caused by the hot and humid environment, the baby’s neck tends to sweat more, if wearing breathable or tight clothes, can lead to prickly heat at the baby’s neck, manifested as a piece of red spot on the neck like ringworm, the treatment should be given to the baby to replace the cool and breathable clothes, and can be used externally with medicines such as glycerite lotion to carry on the treatment. 3. eczema: eczema is a kind of allergy, skin barrier dysfunction caused by the disease, baby neck eczema can be manifested as a piece of red spot like ringworm, treatment can use hydrocortisone cream and other drugs for treatment. In addition to the above factors, hemangioma and other diseases can also lead to a piece of red spot on the baby’s neck like ringworm, should be timely consultation to find out the cause, please doctor to be disposed of.