What could possibly cause a big hard lump on the inner thigh

What is this - painful lump inner thigh??

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There is a reasonably hard lump in my upper right thigh that has gotten bigger over time, and can now be seen visibly through the skin. What might it be? - Quora

There is a small lump under my skin just above the butt crack. What is it? - Quora

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Painful Lump on Thigh, What You Need to Know & How to Treat

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What is usually the cause of a “non-painful lump” on a tendon above the knee? - Quora

I feel pain in my left inner thigh. It doesn't occur in right nor any other place that is on my left leg. I can almost do the front splits but this

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There is a hard lump inside the skin of my armpit and when I pressed it, I felt slight pain & burning sensation. What could it be? - Quora

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Painful Lump on Thigh, What You Need to Know & How to Treat