The first two wave types, P and S , are called body waves because they travel or propagate through the body of Earth. The latter two are called surface waves they the travel along Earth's surface and their amplitude decreases with depth into Earth.
The causes are many and can have bacterial infection, seborrheic dermatitis of the face or even a scalp, rosacea, allergies, and in very rare cases, the lice. If the itchy eyelids is brought about by seborrheic dermatitis then you may develop dry, flakey patches of skin on the eyelid.
1 Eyelid pain and Sensory symptoms (11 causes). 2  Eyelid pain and Eyelid symptoms (10 causes). 3  Eyelid pain and Skin symptoms (10 causes). 4  Eyelid pain and Eyelid swelling (8 causes). 5  Eyelid pain and Skin color changes (7 causes). 6  Eyelid pain and Skin problems (7 causes). 7  Eyelid pain and Itching skin (6 causes).