UV Light Causes Specific Types of Dark Spots. 1  Melasma: Itâs a common condition characterized by grayish patches on the face, forehead or on the upper lip. 2  Solar Lentigines â Freckles: These are red or brown raised spots caused by long term exposure to the sunlight. 3  Ephelides: These fall under the category of freckles.
What is the antibody titer test? The antibody titer is a test that detects the presence and measures the amount of antibodies within a personâs blood. The amount and diversity of antibodies correlates to the strength of the bodyâs immune response.
The results of the rheumatoid factor (RF) test may be reported in titers or units: 1  A titer is a measure of how much the blood sample can be diluted before RF can no longer be detected.2  Nephelometry units show how much light is blocked by the blood sample in the tube.he results of the rheumatoid factor (RF) test may be reported in titers or units: 1  A titer is a measure of how much the blood sample can be diluted before RF can no longer be detected.