The fact it is not swollen and not red, and seems to be sharp in that specific area makes it less likely to be a clot.
And more likely to be irritation of a specific nerve.
That area of skin that is ultrasensitive is suffering from "hyperesthesias" or "allodynia" - where normal sensations seem to cause it pain. This usually is due to irritation to the nerve.
Now what is actually irritating the nerve is a harder question to answer, and it requires further evaluation, starting with a neurologic exam and imaging or further testing if necessary. However, because most nerve irritations/inflammations improve over a few days to weeks, most of these cases get better on their own.
Such pains can come from lumbar nerve root irritation ("pinched nerve" in the back), sacroiliac joint irritation, muscle strains (quad, sartorius), or actual issues with the femur bone. Of course, your symptoms make it sound nerve related.