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Why do I have a red welt on my stomach?

The other day I woke up with what seemed like a bug bite on my stomach. It was about the size of a regular bite, and was really itchy. It's been 2 days, and it has gotten bigger, (it's the size of my palm) and it's hot to touch and is really itchy. I've also been experiencing a headache but I am not sure if it is related to whatever this is. I have spent a lot of time outside the past few days, but I did not notice anything biting me.
It sounds like you may have been bitten by some sort of insect, perhaps a spider. These are common especially when we are sleeping, and most of the time we never end up knowing what exactly bit us. In certain cases, the bite itself can make you really sick. For example, the brown recluse spider bite can cause tissue death around the bite. These bites are quite rare and your description isn't classic. A more common problem that occurs after a bite is bacterial infection. The bite itself can introduce bacterial into the skin, and scratching it can make it worse. In these cases, people need a short course of antibiotics that are active against the staph bacteria. For these reasons, I think that you should get this lesion on your stomach looked at right away. You can schedule an appointment with your primary care physician or if you can't get in right away, go to the emergency room. Either way you can have a doctor examine the area, determine if it is infected, and prescribe the appropriate antibiotic. I also suggest that you track the lesion's growth. You can do this by drawing a line around the edge of it to see if the redness passes the line, or just take photos every day. Good luck.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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