Sounds like it could be a hematoma (I don't know if I spelled that right). It's where blood congeals under the skin. It can be very dangerous, especially in the leg where big arteries are.
But that's just a guess.
Depending on where you are, Germany and India also have good medical care for visitors. They are actually where some people go to have back surgery as it is faaar less expensive than in the States. I think the Dominican Republic is one, too.
I hope wherever you are, you get it checked out. It could be something serious or might not.
Wow. I don't really know much about this. Some countries have great health care systems, others are less than desirable. If I were in England or in Ireland, I would go to the ER.
Flower