Tetracycline is not often used topically, but rather as an oral antibiotic. You can also use it as a solution or ointment at different strengths. Tetracycline contains sodium bisulfite, derived from sulfa. It can cause an allergic reaction and may cause yellowing of the skin. However, it's popular as an oral antibiotic with dermatologists. It may have the same side effects as the other two.
Probably the largest part of the skin care market is products designed to clean the skin and inhibit the formation of acne; these include cleansers, make-up removers and other similar products that can help prevent the condition. This is a market where many people use this type of product every day to condition their skin; often used by those who want to prevent future skin problems from occurring. More specialized cleaners are designed in the same way as acne skin care products; they clean out the pores to help stop sebum or oil which can clog these areas. These products prevent the oil from getting trapped in pores and can hamper the growth of bacteria, this can lead to the bad skin condition.
Most with some form of acne are told to use astringents because of their drying properties, but these simply dry up excess oil and don't really treat or cure acne at all. While excess oil can and does cause acne, using something as harsh as an astringent on your face all the time will only strip your skin of natural oils and cause it to become overly dry. While an astringent can help in some cases, it's usually better to address any problems you may be causing yourself because of diet or other outside factors.
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