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What is Meralgia paraesthetica and explain in detail?
Meralgia paresthetica or meralgia paraesthetica  is numbness or pain in the outer thigh not caused by injury to the thigh, but by injury to a nerve that extends from the spinal column to the thigh.
This chronic neurological disorder involves a single nerve—the  lateral cutaneous nerve of the thigh, which is also called the lateral femoral cutaneous nerve (and hence the syndrome lateral femoral cutaneous neuropathy).  The term "meralgia paraesthetica" combines four Greek roots to mean "thigh pain with anomalous perception".  The disorder has also been nicknamed bikini brief syndrome and skinny pants syndrome, because it can be caused by wearing tight clothing.

Signs and symptoms
Pain on the outer side of the thigh, occasionally extending to the outer side of the knee, usually constant.
A burning sensation, tingling, or numbness in the same area
Multiple bee-sting like pains in the affected area
Occasionally, aching in the groin area or pain spreading across the buttocks
Usually more sensitive to light touch than to firm pressure
Hypersensitivity to heat (warm water from shower feels like it is burning the area)
Occasionally, patients may complain of itching or a bothersome sensation rather than pain in the affected area.The entire distribution of the nerve is rarely affected. Usually, the unpleasant sensation(s) affect only part of the skin supplied by the nerve.

Cause
The lateral femoral cutaneous nerve most often becomes injured by entrapment or compression where it passes between the upper front hip bone (ilium) and the inguinal ligament near the attachment at the anterior superior iliac spine (the upper point of the hip bone).  Less commonly, the nerve may be entrapped by other anatomical or abnormal structures, or damaged by diabetic or other neuropathy or trauma such as from seat belt injury in an accident.The nerve may become painful over a period of time as weight gain makes underwear, belting or the waistband of pants gradually exert higher levels of pressure. Pain may be acute and radiate into the rib cage, and into the groin, thigh, and knee. Alternately, weight loss or aging may remove protective fat layers under the skin, so the nerve can compress against underwear, outer clothing, and—most commonly— by belting. Long periods of standing or leg exercise that increases tension on the inguinal ligament may also cause pressure.The lateral cutaneous nerve of the thigh can occasionally be damaged during laparoscopic hernia repair, or scarring from the operation can lead to meralgia paraesthetica.

Diagnosis
Diagnosis is largely based on patient  description and relevant details about recent surgeries, hip injuries, or repetitive activities that could irritate the nerve