Article: The product has proved to be beneficial for several skin disorders, particularly acne. Retin-A helps to unclogs pores and reduce skin peeling. It can also be useful in reduce the appearance of wrinkles and skin damage due to sun exposure; however, Retin-A cannot cure acne, reverse wrinkles or repair sun damage.  Retin-A has long been recognized as beneficial for the treatment of mild to moderate acne, including blackheads, whiteheads, cysts and lesions in teenagers and adults.  In addition, the appearance of wrinkles are greatly diminished (though they do not disappear) with extended use and increased strength of Retin-A. Darkened skin, also known as sun spots, will also lighten with continued use of Retin-A.  Studies have further shown Retin-A improves the roughness of skin by smoothing or exfoliating the skin surface. Retin-A (generic name: tretinoin) is a derivative of vitamin a and is a member of a group of medications called retinoids that impact the growth of skin cells. Retin-A works by changing the growth patterns and inter-cell attachments of skin cells. It inhibits the development of microcomedones, small plugs in the skin due to dead skin cells gathering inside the pore and clogging it. The development of microcomedones is typically recognized as a precursor to acne; thus, Retin-A works to prevent this from happening and can decrease the number and severity of pimples that do develop. The medication also facilitates quicker healing of acne pimples. In addition, Retin-A decreases the “stickiness” of skin cells in sebaceous follicles or oil glands. If you think Retin-A might be a good option for your skin problems, you should make an appointment with your primary health practitioner who can then recommend you to a dermatologist if needed. Dermatologists are physicians that specialize in the skin and in particular, skin disorders.  Primary care doctors can and often do prescribe Retin-A if its an uncomplicated case, so you may not need to see a dermatologist. Your doctor will be able to choose to most appropriate treatment for you based on your symptoms and particular skin type. Be sure to notify your doctor of any other conditions and medical history, especially if you have or had other skin conditions, such as eczema. Retin-A comes in a topical liquid, gel, and cream formula. Gels are generally better for acne because they have less emollient properties; however, gels can dry the skin, so if you have dry skin, the cream form of Retin-A is likely the best option. Retin-A comes in different medicated strengths, The gel is available as 0.025% or 0.01%. The cream comes as 0.1%, 0.05%, or 0.025%. The liquid comes as 0.05%. Your doctor will generally prescribe a lower strength to begin with and increase strength or dosage as needed. This graduation is to prevent side effects. Mild side effects from using Retin-A are to expected; however, if any of the following side effects become severe, intolerable, or hinder your daily functioning, contact your doctor immediately. Note that most side effects occur during the first two to four weeks of use of Retin-A; in most cases, side effects decrease with continued use. The most common and scientifically documented side effects include:  Skin dryness Blisters and redness of skin Itching, peeling, and scaling A warming or burning sensation Initial increase in acne Since this medication is absorbed through the skin, pregnant women should not use Retin-A because it has been proven to be very teratogenic (can cause birth defects).  If you are using Retin-A to treat acne, do not use other acne products while using Retin-A because they may increase skin irritation. Avoid using peeling products or products that contain peeling agents such as benzoyl peroxide, resorcinol, salicylic acid, or sulfur or other acids.
Question: What is a summary of what this article is about?
Understand what Retin-A is used for. Know how Retin-A works. Consult a doctor. Learn about the different types of Retin-A. Be informed about potential side effects. Know the contraindications.

The needed bacteria grow best when temperatures are warm but not too warm. A couple of degrees either way is fine, but try to keep the water in this range. You can go as low as 77 °F (25 °C). You can do it in a coldwater tank, but it will take longer. Of course, you'll need a water pump system for your fish. More vigorous pumps will help the bacteria grow faster, so if you're in a hurry, pick a pump that moves the water around at a rate of 5 times the amount your tank holds in an hour. For instance, if your tank holds 20 gallons, it should be able to move 100 gallons (380 L). The pH level also affects how quickly your tank will mature. Check the pH levels with a pH kit, which works similarly to the ammonia and nitrate kits. You dip a strip into water, and see what color it turns. Then you compare it to a chart.  The pH levels should be between 7.5 and 8 for ideal conditions. If you need to make the tank more acidic, you can add peat. If you need to make it more alkaline, you can add mineral salts (such as calcium). It you need to create an acidic tank, use a chemical filter instead of developing bacteria. It takes a few weeks for the bacteria to properly develop in the tank. Be patient. Don't add the fish too soon, as you could end up with "new tank" syndrome. Just keep checking the chemical levels.
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One-sentence summary --
Keep the temperature around 85 °F (29 °C). Circulate the water. Test the pH level. Add fish after 2 to 4 weeks when the tank is ready.