Wahhh sayang, dengarnya macam urticaria ke allergic reaction, especially kalau spread macam tu dalam bbrp jam, memang kena monitor closely and get it checked with your doctor asap tau, sebab hari ni perut, kaki, payudara, tomorrow siapa tahu kan, better safe than sorry. A few of my mum friends pernah kena bintik gatal camni and the doctors gave antihistamines, so jangan delay lah, could be something you ate, detergent, fabric, or hormonal je depending on your cycle, tapi betul betul kena tanya doctor sebab nak ensure it's not spreading further and kena manage properly. Hope it settles down soon, nak dengar update tau!