lipid blood test.
2. Fatty Lumps on Tendons, Knuckles, Knees, or Ankles
Some people with inherited high cholesterol, especially familial hypercholesterolemia, may develop fatty lumps called tendon xanthomas. These can appear on the Achilles tendon, knuckles, or knees. NHS Wales explains that tendon xanthomata are cholesterol deposits that show up as fatty lumps in areas such as the Achilles tendons, knuckles, or knees.
These signs are not common in everyone with high cholesterol, but when they appear, they should not be ignored.