Based on the information provided, it is possible that you were stung by an insect such as a bee, wasp, hornet, yellow jacket, or fire ant. These insects are common culprits of stings and can cause symptoms such as redness, swelling, pain, itching, and in some cases, allergic reactions. If you are experiencing severe symptoms such as hives, swelling of the face, lips, throat, or tongue, wheezing, shortness of breath, rapid heartbeat, or faintness, it is important to seek immediate medical attention, as these could be signs of a severe allergic reaction. If you have been stung by a bee and the sting remains in the skin, it is recommended to quickly flick it out using your thumb nail or a credit card, without squeezing the sting to prevent further venom from entering the body. Applying a wrapped ice pack to the affected area can help reduce swelling and pain, and taking antihistamines or pain relievers may also provide relief. If you suspect an allergic reaction, it is crucial to seek medical help promptly.