Three-year-olds are prone to pick up many of the viruses they come into contact with, in part because they have not fully developed the immune system, in part because they tend to touch everything they see. When your 3-year-old child starts vomiting and has a skin rash on his face, you naturally want to know how serious the condition is and how quickly you should seek medical assistance.

Allergies
One possibility is that your 3-year-old child is experiencing an allergic reaction. The rash may be urticaria, which may look pale or reddish bulge anywhere in his body. when. . . According to the Ask Dr. Sears website, urticaria is vomiting and the allergic reaction is usually very serious. Ask your child what she ate last, or if she has been exposed to anything before the start of vomiting, such as plants or animals; this may reveal the root cause of the problem. If you suspect that your child has taken toxic substances, call poison control or seek emergency medical help.
Scarlet fever
Your 3-year-old rash may be a symptom of scarlet fever. According to the KidsHealth website, although the rash is characterized by a red rash with a small bump, the face is usually affected and the rash may reduce red. Scarlet fever is caused by group A streptococci, which is the same bacteria that cause streptococcal infection. The most common symptoms are rash, vomiting, fever, pain in the body's throat or tongue, or a white coating.
Sepsis or meningitis
Your child's vomiting and rash may be the result of sepsis or meningitis. Meningitis is associated with sepsis; according to the Meningitis Research Foundation, meningitis is swelling of the inner layer around the brain or spinal cord, while sepsis is a blood poisoning caused by bacteria or viruses that cause meningitis. If your 3 year old has sepsis or meningitis, her first symptom may be vomiting, fever or headache, and she may have pale or mottled skin or a rugged rash that may appear light brown and then develop A large red bump.
HeConsult a pediatrician
Whenever your 3-year-old child has an unusual rash, contact your pediatrician to apply for an ointment. Three-year-olds may not remember the things they touch or eat, but the pediatrician can determine the cause of the problem. A rash is usually not the cause of concern, but in some cases, such as allergies, scarlet fever or meningitis, rashes and underlying diseases will require treatment. If your child begins to have difficulty breathing or if you suspect she has sepsis or meningitis, go directly to the emergency room. These conditions can be life-threatening and require immediate treatment.