In dermatology, PDT with the photosensitizer Levulan Kerastick (20% delta-aminolevulinic acid HCl) is used for the treatment of very early, thin skin cancers called actinic keratoses (AK). The initial approval was specifically for the treatment of actinic keratosis of the face and scalp with a combination of an application of the photosensitizer followed by a timed exposure to a special blue light source. PDT is also used for acne, rosacea, skin cancer, sun damage, cosmetic skin improvement, oily skin, enlarged sebaceous glands, wrinkles, rejuvenation (anti-aging), warts, hidradenitis suppurativa, psoriasis, and many other skin conditions.
While acne is a much more visible condition than most, it is important to remember that it is like most diseases, in which early detection can help to mitigate its impact. Bearing that in mind, we have taken the time to put together 10 of the most common causes for acne, so that you can be better informed and potentially avoid some (and only some) of its root causes.
Chemical peels. Chemical peels can reduce the appearance of shallow acne scars and post-inflammatory hyper-pigmentation around a healed acne lesion. A chemical peel may be administered by a doctor, nurse, nurse practitioner, or spa aesthetician and involves applying a chemical to your skin to remove its outer layer, giving it a smoother, more even appearance. Depending on the strength of the acid used, you may experience redness and peeling for a few days afterward.

Old marks still sticking around take patience and consistency to treat. One way to even out skin tone over time is with regular exfoliating. "[Exfoliating] is important in treating acne scars at home as it lifts dead skin and allows new skin to grow and proliferate," Dr. Moy explains. This exfoliator contains papaya enzymes to break down dead skin cells and microderm crystals to buff away acne scars. Aloe vera, coconut, and vitamins E and B nourish the skin simultaneously.

Millions of teens and adults alike have had some form of acne at some point in their lives. It is a very common occurrence, and each type of acne that exists affects a different cross-section of people. However, what is important in every single case is finding a reliable acne treatment so symptoms go away quickly and without all that much hassle or expense.


Use retinoid skin products. Retinoids are vitamin A derivatives which are used in a wide array of skin care products treating fine lines and wrinkles, skin discoloration, and acne. Retinoids boost collagen production and speed up cell turnover, making them a great choice for targeting acne scars. These creams can be a little on the pricey side, but they are highly recommended by dermatologists for their fast, effective results.

Genetics can also have an effect on acne breakouts, and may be the reason some people are acne-prone while others are not. One of the top cited studies took a look at 458 pairs of identical twins and 1099 pairs of fraternal twins to study acne prevalence. They found that genes explained a significant 81 percent of the difference in acne prevalence, while the other 19 percent was explained by non-shared environmental factors. 
Rolling scars can look like little saucers, giving the skin a wavy texture. Lasers that resurface the skin are Dr. Karolak's top treatment pick for this type of scar, and Dr. Sobel agrees. "Many scars can be improved with lasers such as the matrix CO2, which remove the outer layers of skin, burning away the scar tissue and stimulate new collagen production," he says. "Non-ablative lasers such as the Fraxel can help activate the production of collagen without damaging the surface of the skin." Keep in mind, that these laser treatments can take a bit of recovery time and require multiple treatments to see results. For a quicker solution, your dermatologist can plump the bowl-like scar with fillers like Juvederm, Restylane, or Bellafill.
Acne scar treatment: “You have to take all of these factors into account, and I always advise people that multiple treatments will be needed, and even after a year or two, a 50 percent improvement may be all they get,” Dr. Levine says. Still, it’s important to remember that less visible or deep scars can still make a difference to a person’s self-esteem. “It takes patience, but every scar can be improved, and even if the results are not perfect,” says Dr. Hellman.
Light treatments: Recent years have brought reports of success in treating acne using special lights and similar devices, alone or in conjunction with photosensitizing dyes. It appears that these treatments are safe and can be effective, but it is not clear that their success is lasting. At this point, laser treatment of acne is best thought of as an adjunct to conventional therapy, rather than as a substitute.
No one factor causes acne. Acne occurs when sebaceous (oil) glands attached to the hair follicles are stimulated at the time of puberty or due to other hormonal changes. Sebum (oil) is a natural substance that lubricates and protects the skin. Associated with increased oil production is a change in the manner in which the skin cells mature, predisposing them to plug the follicular pore. The plug can appear as a whitehead if it is covered by a thin layer of skin, or if exposed to the air, the darker exposed portion of the plug is called a "blackhead." The plugged hair follicle gradually enlarges, producing a bump. As the follicle enlarges, the wall may rupture, allowing irritating substances and normal skin bacteria access into the deeper layers of the skin, ultimately producing inflammation. Inflammation near the skin's surface produces a pustule; deeper inflammation results in a papule (pimple); if the inflammation is deeper still, it forms a cyst.
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