Blue light rays penetrate follicles to kill off acne-causing bacteria. For severe cases, photodynamic therapy adds a topical solution called Levulan to blue light therapy. Note that these treatments can cause temporary redness and may not be covered by insurance. Prices vary greatly depending on the location and severity of acne, but can cost at least $50 for one blue light treatment and $100 or more per photodynamic therapy session. Most patients will need multiple treatments to see effective results, but many dermatologists offer package deals.
Hypertrophic scars are uncommon, and are characterized by increased collagen content after the abnormal healing response. They are described as firm and raised from the skin. Hypertrophic scars remain within the original margins of the wound, whereas keloid scars can form scar tissue outside of these borders. Keloid scars from acne occur more often in men and people with darker skin, and usually occur on the trunk of the body.
This problem is normally located on the face, back, and upper portion of the chest. These areas are worst hit because they have the highest number of oily glands. What a lot of people don’t realize is that there are several different types of this issue. And to make matter even more complicated, each of these types have their own causes and effects as well as methods of prevention. 
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You’ll need to practice patience with acne treatments that contain tretinoin, but many users say the wait is worth it, considering the results. Generally, it takes up to six months, but often less, to notice results from tretinoin. Note: you may experience a slight increase in acne in the first couple of weeks of use, but it’s only temporary as your body adjusts to the medicine.
However, salicylic acid isn’t just for those of us with sensitive skin. It can also help those of you with tougher skin, through higher concentrations. Over-the-counter, you can find salicylic acid in concentrations up to 2 percent, but if you want something even more intense, many spas and dermatology offices offer salicylic acid chemical peels with 20-30 percent salicylic acid. Beware, these peels will likely leave your face very photosensitive for a few days, but they have been known to significantly reduce sebum for a few weeks at a time.
Although some people think they can get the best acne treatment by mixing and matching products, this is not the recommended method of treating blemishes. Aside from doctors, few people understand how different products can react with each other. In some cases, combining two products increases how well both work. For example, green tea extract and salicylic acid complement each other. Skin care system makers usually hire doctors to help improve the effectiveness of their systems.
^ White, Stephen D.; Bordeau, Patrick B.; Blumstein, Philippe; Ibisch, Catherine; GuaguÈre, Eric; Denerolle, Philippe; Carlotti, Didier N.; Scott, Katherine V. (1 September 1997). "Feline acne and results of treatment with mupirocin in an open clinical trial: 25 cases (1994–96)". Veterinary Dermatology. 8 (3): 157–164. doi:10.1046/j.1365-3164.1997.d01-16.x. ISSN 1365-3164.
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