Hi,
There can be many causes for an underneath thigh swelling
1. It could be an abscess,cellulitis
2. it could be osteomyeletis
3. It can be haematoma
Do you have any bleeding tendency ?
Is the temperature raised,and do you have fever ?
Did you have any injury or trauma ?(even if not then to go for an x-ray because in most cases the trauma is to trivial)
Are you a diabetic ?
Do you see any kind of veins all over your legs ?
Have you noticed any kind of pus ?(because it could simply indicate ...
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