Girls, can anyone tell me what this could be? After childbirth, somet…

Girls, can anyone tell me what this could be? After childbirth, something like that starts itching the skin once or twice a day, it's itchy, in different places each time. After I scratch it, the skin gets very red and swollen, then it goes away. And so every day. I live in a warm climate by the sea. Who knows what this could be?