More than 1 year old baby suddenly appeared palm red and swollen like congestion without pain, may be caused by angioneurotic edema, insect bite dermatitis, etc.. 1. Angioneurotic edema: usually caused by allergies, increased vascular permeability, resulting in local tissue edema. It can be manifested as the sudden appearance of red, swollen-like congestion in the palms of the hands without pain. Some children may be accompanied by serious symptoms such as laryngeal edema and dyspnea. 2. Insect bite dermatitis: can be caused by mites, mosquitoes, midges, bedbugs, fleas, ticks and other insect bites or venomous sap stimulation, manifested as lesions visible pinpoint-sized bites, self-conscious itching, edematous cellulite-like symptoms. More than 1 year old baby suddenly appeared in the palm of the hand red and swollen like congestion without pain, there may be other diseases, it is recommended to seek medical attention as soon as possible to identify the cause, if necessary, with the doctor’s treatment.