The most likely reason is because of the rough texture of these socks. Most thigh high socks are made of cotton. If the raw material is long-staple cotton, their fluff is very long and feels very soft. But if the raw material of your socks is short-staple cotton, these fluffs are just like turf that has just been cut, which can easily make you itchy.
If the top band of the thigh high socks is too tight, it will also make you itchy. Some thigh high socks have insufficient elasticity, and the top band cannot be stretched to a sufficient width, and then they will make muffins on the thighs. When these muffin marks stay on your thigh for an hour, you will feel itching, and even if you take off these socks, the itching will not stop immediately.
Kayhoma thigh high socks are all woven with long-staple cotton yarn. They are very soft and feel close to thin sweaters. They also have good elasticity and a wider top band. They can protect the blood circulation well of the thighs without causing muffin thighs or making you itchy.