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.
Any irritation of the cornea or conjunctiva can lead to watery eye. Inflammation of the conjunctiva from (conjunctivitis) infection, irritants (chemical splash, etc.), or allergy is a common cause of itchy, watery eyes, as well as eye swelling. Infection of the eye can require antibiotics in the form of prescription eyedrops.