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.
Common short-term complications of eyelid inflammation include dry eyes and pink eye. Long-term complications may include: scarring on the eyelid; a stye (an infected lump that appears on the base of your eyelashes) chronic pink eye; The oil glands on your eyelids can also become infected and blocked. This can cause an infection under your eyelids. An untreated eye infection can cause permanent eye damage and vision loss. Scarring under the eyelids can scratch the eyeâs delicate surface.