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. Blepharitis (Eyelid Inflammation). Blepharitis or inflammation of the eyelids is a common condition that can cause redness and swelling of the eyelids. About one in twenty eye problems seen by general practitioners consist of puffy itchy eyelids due to blepharitis.It is common in adults aged 50 and above, although it is seen at any age.he eyes are very sensitive, and swelling in any part in or around it can cause a lot of discomfort. Itchy and swollen eyelids can result from various factors and treatments may vary. Here are some reasons why people have puffy itchy eyelids and their treatment options.