Skin ulcers in one year old children can be caused by eczema, herpes, impetigo, contact dermatitis and so on. 1. Eczema: Inflammatory skin reaction caused by internal and external stimulation of a variety of factors, acute eczema can cause skin erythema, vesicles, rashes, oozing and other symptoms, which may lead to a one-year-old child’s skin ulcers. 2. Herpes: Herpes simplex or herpes zoster caused by viral infection can also cause skin rashes, blisters, ulcers and other symptoms, so it can also lead to a one-year-old child’s skin ulcers. 3. impetigo: mainly caused by staphylococcus aureus, type b hemolytic streptococcus infection caused by purulent inflammation of the skin, will cause skin spots, pimples, and then turned into pustules, and blisters with thin walls, easy to break, vesicles, pus drying after the formation of dense yellow thick scabs, can also appear one year old child skin ulcers. 4. contact dermatitis: contact with certain exogenous substances, inflammatory reactions occur in the skin and mucous membrane areas, typical damage for the border clear erythema, lesion morphology and contact with the material, will cause pimples, pimples, blisters and blisters in severe cases, breakage is vesicles, will cause a year-old child skin ulcers. There may be other causes of skin ulcers in one year old children, which need to be promptly examined in the hospital and treated according to medical advice.