Pulsed and LHE (Light Heat Energy)

LHE can kill acne bacteria. LHE also tends to decrease sebum (the natural skin oil). Excess sebum production is considered one of the major factors encouraging acne development. This green light tends to shrink sebaceous glands.

The therapy is approved by the FDA for treating mild to moderately severe acne. Both inflammatory and non-inflammatory acne can be reduced by two treatments per week over a period of one month. Drug-based treatments tend to take two or three months or longer.

Blue Light

The main effect is to kill the bacteria, but there is some effect on the skin oil. It can cause a slight dryness. The narrow band light contains a negligible amount of UV wavelengths.

Patients receive treatments twice per week over a period of about a month. It’s effective on forms other than more severe acne, such as those that produce nodules or cysts. The latter can actually be made worse with blue light treatment. Improvements ranged from complete remission to about 40% decrease in the number of lesions, in several studies. About two-thirds saw between a 59% to 67% reduction of inflammatory acne lesions.

ALA (5-aminolevulinic acid)

ALA is a compound applied to the skin. It doesn’t have any of the antibacterial properties of standard acne treatments like Accutane. It works by making the skin more sensitive to light, thus increasing the effectiveness of light treatment.

It’s kept on for 15 minutes to an hour, during which the patient receives blue or red light treatment. The jury is still out so numbers are sketchy, but early results suggest the treatment is safe and effective.

Lasers

Normal light contains waves that scatter in all directions. In the case of acne treatment lasers, one popular type produces waves of 1450 nm (nanometers, a billionth of a meter). This type is particularly safe and effective.

In one study, one treatment reduced acne lesions by nearly 40%. Two treatments decreased them by nearly 60% and with three the number rose to over 80%. There is some mild pain associated with the treatments, however, so a topical anesthetic is used during the procedure.