My daughter has a big redness on her arm since her 18-month vaccine. She has never reacted on her skin before. It has been getting bigger since yesterday. What should I do?

It is advisable to consult a doctor if there is a noticeable increase in redness on the arm after a vaccination, as it could indicate an infection. If the swelling has decreased slightly, you can monitor the redness by drawing a line around it and see if it spreads beyond that line. If the redness continues to enlarge, it is recommended to seek medical advice. Otherwise, it may be appropriate to wait a few days before seeing a doctor if the child is otherwise healthy.