It May Not Be Suitable for ChildrenMatcha tea is not recommended for children due to its caffeine content. The younger the child, the more likely they are to have an adverse reaction to caffeine, even in small amounts. As per Pittsburgh Healthcare Report, Matcha tea can also damage liver function in children It May Cause a RashMatcha tea may cause contact dermatitis, which is a rash that develops when the skin comes into contact with an allergen.If you develop a rash after drinking matcha tea, it’s important to stop consuming it and talk to your doctor.