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In human skin, topical retinoids increase collagen production, induce epidermal hyperplasia, and decrease keratinocyte and melanocyte atypia. Topical tretinoin is the most extensively investigated retinoid therapy for photoaging. [23] Topical tretinoin can be used for mild to severe photoaging in people of all skin types.
For example, DEXA Scan is a 10-minute scan that quantifies your body composition; hydrostatic (dunk tank) testing measures body fat percentage by calculating the amount of water displaced when you ...
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Isotretinoin may cause liver failure, therefore the patient's blood levels should be regularly tested. [9] It is known to cause birth defects due to in-utero exposure because of the molecule's close resemblance to retinoic acid , a natural vitamin A derivative that controls normal embryonic development.
Generally speaking, retinoids increase the skin's sensitivity to sunlight and are therefore recommended for use at night. [1] Tretinoin is the least expensive of the topical retinoids and is the most irritating to the skin, whereas adapalene is the least irritating but costs significantly more.
Adapalene Gel, sold in trade name Differin in China. Adapalene, sold under the brand name Differin among others, is a third-generation topical retinoid primarily used in the treatment of mild-moderate acne, and is also used off-label to treat keratosis pilaris as well as other skin conditions. [6]
Diagnosis can be difficult, as serum retinol is not sensitive to toxic levels of vitamin A, but there are effective tests available. Hypervitaminosis A is usually treated by stopping intake of the offending food(s), supplement(s), or medication. Most people make a full recovery.
The Fitzpatrick scale (also Fitzpatrick skin typing test; or Fitzpatrick phototyping scale) is a numerical classification schema for human skin color. It was developed in 1975 by American dermatologist Thomas B. Fitzpatrick as a way to estimate the response of different types of skin to ultraviolet (UV) light. [ 2 ]