Hi, There can be several possible causes for red bumps on the neck and legs of an infant. Some of the common causes include: * Heat rash: This is a common condition in infants caused by blocked sweat ducts. It can cause small, red bumps on the skin, usually in areas where the skin folds or rubs together. * Allergic reaction: An allergic reaction to food, clothing, detergent, or other environmental factors can cause red bumps on the skin. * Eczema: Eczema causes red, itchy patches on the skin and this condition can be chronic and last for over six months too. It can also cause small bumps and blisters. * Viral infection: Certain viral infections, such as chickenpox, can cause red bumps on the skin. * Insect bites: Mosquito bites, flea bites, and other insect bites can cause small red bumps on the skin. It is important to have a medical professional examine the bumps and evaluate other symptoms to determine the underlying cause and appropriate treatment. High liver enzymes may indicate a liver problem or other health issue, and it is important to follow up with the doctor for further testing and evaluation. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician